Valve core of pressure-limiting valve

Abstract

The utility model relates to the field of valve cores, in particular to a pressure-limiting valve core, and adopts the technical scheme that the pressure-limiting valve core comprises a pressure-limiting valve main body, a three-way joint, a pressure release valve sealing head, a valve core main body, an oil inlet cylinder and an oil inlet, rubber grooves which are distributed at equal intervals are formed in the outer wall of the valve core main body, and sealing rubber is mounted in the rubber grooves; an oil inlet cylinder is fixedly connected to the rear end of the valve element body, oil inlet holes distributed around the oil inlet cylinder at equal intervals are formed in the outer wall of the oil inlet cylinder in a penetrating mode, an oil inlet is fixedly connected to the rear end of the oil inlet cylinder, oil discharge holes distributed around the oil inlet at equal intervals are formed in the outer wall of the oil inlet in a penetrating mode, and a balance groove is formed in the outer wall of the rear end of the oil inlet. According to the pressure-limiting valve core, the valve core main body which is made of alloy steel 20Cr materials and is subjected to carburizing heat treatment and outer diameter precise grinding after machining is adopted, so that the service life of the pressure-limiting valve core can be effectively prolonged, and the air tightness of the valve core main body at the pressure-limiting valve main body part can be enhanced in an auxiliary manner by multiple layers of sealing rubber so as to reduce leakage.

Description

Technical Field

[0001] The utility model belongs to the field of valve cores, and in particular relates to a valve core of a pressure-limiting valve. Background Art

[0002] The oil pump is a key component of the engine lubrication system. It is often installed inside the engine oil pan to provide lubricating oil for circulation to various components inside the engine. The flow and pressure of the lubricating oil have a very important influence on the lubrication effect. The pressure limiting valve on the oil pump is the key structure for controlling the lubricating oil pressure.

[0003] The existing valve core equipment often achieves stability by moving back and forth in the valve hole of the pressure limiting valve due to the action of the lubricating oil pressure at the head and the spring force at the tail when the valve core of the pressure limiting valve is working. The existing smooth valve core made of steel is prone to wear of the valve core and the inner wall of the valve hole due to friction between the outer wall of the valve core and the inner wall of the valve hole during use. At the same time, since the end of the valve core needs to move to the other side of the oil outlet channel during the oil leakage process, the single sealing structure is prone to oil leakage when a fault occurs, which ultimately leads to the problem that the flow rate and pressure of the lubricating oil cannot be accurately controlled.

[0004] Therefore, in order to solve the problems of short service life and poor sealing effect of the existing pressure limiting valve core, a pressure limiting valve core is developed. By adding alloy steel 20Cr material, hydraulic balance structure and multi-layer sealing structure to the valve core, the service life of the valve core when used in the pressure limiting valve can be greatly improved, and the overall air tightness and stability of the pressure limiting valve can be improved. Utility Model Content

[0005] In order to overcome the problems of short service life and poor sealing effect of the existing pressure limiting valve core.

[0006] The technical solution of the utility model is: a pressure limiting valve spool, including a pressure limiting valve body, a three-way joint and a pressure relief valve sealing head, and also including a valve spool body, an oil inlet cylinder and an oil inlet port. The outer wall of the valve spool body is provided with equidistantly distributed rubber grooves, and a sealing rubber is installed in the rubber groove. The rear end of the valve spool body is fixedly connected to the oil inlet cylinder, and the outer wall of the oil inlet cylinder is penetrated by oil inlet holes equidistantly distributed around the oil inlet cylinder. The rear end of the oil inlet cylinder is fixedly connected to the oil inlet port, and the outer wall of the oil inlet is penetrated by oil discharge holes equidistantly distributed around the oil inlet port. The rear end outer wall of the oil inlet port is provided with a balancing groove.

[0007] Preferably, by processing the valve core body from 20Cr alloy steel material and performing carburizing heat treatment and outer diameter precision grinding after machining, its service life can be effectively improved, and the evenly distributed oil inlet and oil outlet holes can achieve balanced force on the valve core when oil is leaking, thereby achieving the self-balancing effect of the valve core body. The balancing groove can improve the pressure difference effect in the high-pressure area of ​​the valve core head, and can also achieve the effect of oil storage and lubrication, which is also beneficial to the self-balancing of the valve core, and the multi-layer sealing rubber can also assist in enhancing the air tightness of the valve core body in the pressure limiting valve body to reduce leakage.

[0008] Preferably, the valve core body is made of 20Cr alloy steel material, and the valve core body is compatible with the pressure limiting valve body.

[0009] Preferably, a valve body bracket is fixedly connected to the outer wall of the lower end of the pressure-limiting valve body, and a mounting bracket symmetrically distributed frontward and rearward is fixedly connected to the lower end of the valve body bracket.

[0010] Preferably, a three-way joint is installed at the rear end of the pressure-limiting valve body, and a first joint and a second joint which are symmetrically distributed on the left and right are fixedly connected to the outer wall of the three-way joint.

[0011] Preferably, a pressure relief valve sealing head is installed at the rear end of the three-way joint, and the front end of the pressure relief valve sealing head is fitted with the rear end of the valve core body.

[0012] Preferably, a valve core spring is installed inside the pressure-limiting valve body, and the valve core body is installed at the rear end of the valve core spring.

[0013] Preferably, the outer wall of the sealing rubber fits in contact with the inner wall of the pressure-limiting valve body, and the outer walls of the oil inlet and the oil inlet cylinder fit in contact with the inner wall of the pressure-limiting valve body.

[0014] Beneficial effects of the utility model:

[0015] 1. The valve core body is made of 20Cr alloy steel and then undergoes carburizing heat treatment and outer diameter precision grinding after machining. Compared with the original pressure limiting valve body, its service life can be effectively extended;

[0016] 2. The evenly distributed oil inlet and outlet holes can achieve balanced force on the valve core when the oil is drained, thus achieving the self-balancing effect of the valve core body. The balancing groove can improve the pressure difference effect in the high-pressure area of ​​the valve core head and also achieve the function of oil storage and lubrication. Compared with the smooth valve core structure, it is conducive to the self-balancing of the valve core.

[0017] 3. The multi-layer sealing rubber can also help enhance the air tightness of the valve core body in the main body of the pressure limiting valve to reduce leakage. Compared with the original pressure limiting valve structure, it can greatly improve its own air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1Shown is a schematic diagram of the three-dimensional structure of the valve core of the pressure limiting valve of the present utility model;

[0019] Figure 2 Shown is a schematic diagram of the three-dimensional structure of the valve core of the pressure limiting valve of the present invention;

[0020] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the valve body bracket, pressure limiting valve body, three-way joint and pressure limiting valve sealing head of the valve core of the pressure limiting valve of the present invention;

[0021] Figure 4 Shown is a schematic diagram of the exploded three-dimensional structure of the pressure limiting valve body, three-way joint and valve core spring of the pressure limiting valve core of the utility model;

[0022] Figure 5 Shown is a schematic diagram of the three-dimensional structure of the valve core body, sealing rubber and oil inlet cylinder of the pressure limiting valve core of the utility model;

[0023] Figure 6 Shown is a schematic diagram of the three-dimensional structure of the oil inlet of the pressure-limiting valve core of the present invention.

[0024] Explanation of the accompanying drawings: 1-valve body bracket, 2-pressure limiting valve body, 3-tee joint, 4-pressure relief valve sealing head, 5-valve core body, 6-oil inlet cylinder, 7-oil inlet, 8-mounting bracket, 9-first joint, 10-second joint, 11-valve core spring, 12-oil inlet hole, 13-rubber groove, 14-sealing rubber, 15-oil drain hole, 16-balancing groove. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See also Figures 1-6The utility model provides an embodiment: a pressure limiting valve core, including a pressure limiting valve body 2, a three-way joint 3 and a pressure relief valve sealing head 4, and also including a valve core body 5, an oil inlet cylinder 6 and an oil inlet port 7. The outer wall of the valve core body 5 is provided with rubber grooves 13 distributed at equal intervals, and a sealing rubber 14 is installed in the rubber groove 13. The rear end of the valve core body 5 is fixedly connected to the oil inlet cylinder 6, and the outer wall of the oil inlet cylinder 6 is penetrated with oil inlet holes 12 distributed at equal intervals around the oil inlet cylinder 6. The rear end of the oil inlet cylinder 6 is fixedly connected to the oil inlet port 7, and the outer wall of the oil inlet port 7 is penetrated with oil discharge holes 15 distributed at equal intervals around the oil inlet port 7. The rear end of the oil inlet port 7 A balancing groove 16 is provided on the outer wall of the end. The valve core body 5 is made of 20Cr alloy steel and is subjected to carburizing heat treatment and outer diameter precision grinding after machining, which can effectively improve its service life. The evenly distributed oil inlet holes 12 and oil discharge holes 15 can achieve balanced force on the valve core during oil leakage, thereby achieving the self-balancing effect of the valve core body 5. The balancing groove 16 can improve the pressure difference effect in the high-pressure area of ​​the valve core head, and can also achieve the effect of oil storage and lubrication, which is also beneficial to the self-balancing of the valve core. The multi-layer sealing rubber 14 can also assist in enhancing the air tightness of the valve core body 5 in the pressure-limiting valve body 2 to reduce leakage.

[0027] See also Figure 3-Figure 5 In this embodiment, the valve core body 5 is made of 20Cr alloy steel material, and the valve core body 5 is compatible with the pressure-limiting valve body 2. When in use, the valve core body 5 made of 20Cr alloy steel material can greatly enhance the strength of the valve core body 5. The outer wall of the lower end of the pressure-limiting valve body 2 is fixedly connected with a valve body bracket 1, and the lower end of the valve body bracket 1 is fixedly connected with mounting brackets 8 that are symmetrically distributed front and back. When in use, the valve body bracket 1 cooperates with the mounting bracket 8 to stably support the pressure-limiting valve body 2 while also making it easier for workers to install it. A three-way joint 3 is installed at the rear end of the pressure-limiting valve body 2, and the outer wall of the three-way joint 3 is fixedly connected with a first joint 9 and a second joint 10 that are symmetrically distributed left and right. When in use, the three-way joint 3 can facilitate workers to connect to other pipelines for installation and use.

[0028] See also Figure 4-Figure 6In this embodiment, a pressure relief valve sealing head 4 is installed at the rear end of the three-way joint 3, and the front end of the pressure relief valve sealing head 4 is in contact with the rear end of the valve core body 5. When in use, the pressure relief valve sealing head 4 installed by threading can facilitate workers to disassemble and maintain the interior of the valve core body 5 or the valve core body 5. A valve core spring 11 is installed inside the pressure limiting valve body 2, and the valve core body 5 is installed at the rear end of the valve core spring 11. When in use, the pressure at which the valve core body 5 opens is set by utilizing the preload force of the valve core spring 11. The outer wall of the sealing rubber 14 is in contact with the inner wall of the pressure limiting valve body 2, and the outer walls of the oil inlet 7 and the oil inlet cylinder 6 are in contact with the inner wall of the pressure limiting valve body 2. When in use, the sealing rubber 14 can enhance the overall air tightness of the interior of the pressure limiting valve body 2.

[0029] During installation, first, install the mounting bracket 8 on the valve body bracket 1 to the vehicle engine bracket by means of bolts, and then install the first joint 9 and the second joint 10 to appropriate vehicle equipment respectively through pipes;

[0030] When in use, the valve core body 5 in the pressure-limiting valve body 2 transports the lubricating oil in the oil pump to various components inside the engine under the action of the lubricating oil pressure at the head and the spring force at the tail, so as to circulate and provide lubricating oil, and control the flow and pressure of the lubricating oil in the oil pump so that the oil pump can transport the lubricating oil to the engine at an appropriate and precise flow and pressure for lubrication.

[0031] Through the above steps, the service life of the valve core body 5 can be effectively improved by processing it from alloy steel 20Cr material and performing carburizing heat treatment and outer diameter precision grinding after machining. The multi-layer sealing rubber 14 can also assist in enhancing the air tightness of the valve core body 5 in the pressure limiting valve body 2 to reduce leakage, thereby solving the problem of the low service life and poor sealing effect of the existing pressure limiting valve core.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present invention.

Claims

1. A pressure limiting valve core, comprising a pressure limiting valve body (2), a three-way joint (3) and a pressure relief valve sealing head (4), characterized in that: The invention also includes a valve core body (5), an oil inlet cylinder (6) and an oil inlet port (7). The outer wall of the valve core body (5) is provided with rubber grooves (13) distributed at equal intervals. A sealing rubber (14) is installed in the rubber groove (13). The rear end of the valve core body (5) is fixedly connected to the oil inlet cylinder (6). The outer wall of the oil inlet cylinder (6) is provided with oil inlet holes (12) distributed at equal intervals around the oil inlet cylinder (6). The rear end of the oil inlet cylinder (6) is fixedly connected to the oil inlet port (7). The outer wall of the oil inlet port (7) is provided with oil discharge holes (15) distributed at equal intervals around the oil inlet port (7). The rear end outer wall of the oil inlet port (7) is provided with a balancing groove (16).

2. The pressure limiting valve core according to claim 1, characterized in that: The valve core body (5) is made of 20Cr alloy steel, and the valve core body (5) is compatible with the pressure-limiting valve body (2).

3. The pressure limiting valve core according to claim 2, characterized in that: The outer wall of the lower end of the pressure-limiting valve body (2) is fixedly connected to a valve body bracket (1), and the lower end of the valve body bracket (1) is fixedly connected to mounting brackets (8) that are symmetrically distributed front and back.

4. The pressure limiting valve core according to claim 3, characterized in that: A three-way joint (3) is installed at the rear end of the pressure-limiting valve body (2), and a first joint (9) and a second joint (10) symmetrically distributed on the left and right are fixedly connected to the outer wall of the three-way joint (3).

5. The pressure limiting valve core according to claim 4, characterized in that: A pressure relief valve sealing head (4) is installed at the rear end of the three-way joint (3), and the front end of the pressure relief valve sealing head (4) is in contact with the rear end of the valve core body (5).

6. The pressure limiting valve core according to claim 5, characterized in that: A valve core spring (11) is installed inside the pressure-limiting valve body (2), and a valve core body (5) is installed at the rear end of the valve core spring (11).

7. The pressure limiting valve core according to claim 6, characterized in that: The outer wall of the sealing rubber (14) fits in contact with the inner wall of the pressure-limiting valve body (2), and the outer walls of the oil inlet (7) and the oil inlet cylinder (6) fit in contact with the inner wall of the pressure-limiting valve body (2).

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