Pressure-regulating built-in overflow valve

Abstract

The utility model discloses a built-in overflow valve for pressure regulation, which comprises a valve sleeve and a threaded sleeve which are in threaded connection, a valve core is arranged in the valve sleeve, an oil inlet and an oil return port are arranged on the valve sleeve, a pressure regulating screw is arranged in the threaded sleeve, a spring is arranged between the pressure regulating screw and the valve core, and the valve core is provided with an oil inlet and an oil return port. And a screw plug screwed with the end part of the screw sleeve is arranged on the outer side of the pressure adjusting screw. Compared with the prior art, the overflow valve has the advantages that the structure is simple and reasonable, the screw plug in threaded connection with the end of the threaded sleeve is arranged on the outer side of the pressure adjusting screw, so that the pressure adjusting structure is arranged in the threaded sleeve, exposure of the pressure adjusting structure is avoided, mistaken touch in the using process of the overflow valve is effectively prevented, and the reliability of set pressure is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow valve manufacturing, in particular to a pressure-regulating built-in overflow valve. Background Art

[0002] The overflow valve is an indispensable control element in the hydraulic system, used to control the system pressure within a limited safety range. The overflow valve is often equipped with a pressure adjustment mechanism to adjust the set pressure of the overflow valve.

[0003] The existing overflow valves have an exposed pressure regulating structure. For example, an overflow valve disclosed in a patent application with application number CN201721507421.9 and titled “Overflow valve and EMU braking system using the same” has an outer end of the adjusting screw exposed to the outside. The exposed pressure regulating structure poses a risk of accidental touch, so its structure needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to make up for the above-mentioned deficiencies and disclose to the public a pressure regulating built-in overflow valve which has a simple and reasonable structure and can effectively avoid accidental touch.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A pressure regulating built-in overflow valve comprises a valve sleeve and a screw sleeve which are threadedly connected to each other, a valve core is arranged in the valve sleeve, an oil inlet and an oil return port are arranged on the valve sleeve, a pressure regulating screw is arranged in the screw sleeve, a spring is arranged between the pressure regulating screw and the valve core, and a screw plug which is threadedly connected to the end of the screw sleeve is arranged on the outer side of the pressure regulating screw.

[0007] The measures to further optimize this technical solution are:

[0008] As an improvement, the pressure regulating screw is provided with a straight groove, and a locking screw is eccentrically provided on the pressure regulating screw corresponding to the straight groove. The straight groove is provided to divide the thread on the pressure regulating screw into two sections, and the pressure regulating screw is deformed by tightening the locking screw, thereby achieving the purpose of axial locking.

[0009] As an improvement, the depth of the straight groove is greater than the radius of the pressure regulating screw. This arrangement can increase the deformation amount to a certain extent.

[0010] As an improvement, a through hole penetrating the pressure regulating screw is axially arranged on the pressure regulating screw.

[0011] As an improvement, the valve core is provided with an axial blind hole and a radial hole communicating with each other.

[0012] As an improvement, the pressure regulating screw is provided with a first spring assembly part, the valve core is provided with a second spring assembly part, one end of the spring is sleeved outside the first spring assembly part, and the other end is sleeved outside the second spring assembly part. The provision of the spring assembly part facilitates the assembly of the spring and can also play a positioning role to prevent the spring from slipping.

[0013] As an improvement, the oil inlet is arranged axially, and the oil return port is arranged radially.

[0014] As an improvement, the end of the valve core is provided with a conical surface.

[0015] As an improvement, the pressure regulating screw is provided with a first inner hexagon socket, and the screw plug is provided with a second inner hexagon socket.

[0016] As an improvement, the outer periphery of the valve core is provided with an assembly groove, and a sealing ring and a retaining ring are embedded in the assembly groove. The sealing ring and the retaining ring constitute a sealing structure, and the setting of the retaining ring limits the sealing ring to ensure the reliability of the seal; at the same time, the setting of the sealing ring and the retaining ring can increase the friction force, increase the damping when the valve core moves, and reduce the vibration when the valve core is opened.

[0017] The advantages of the utility model compared with the prior art are:

[0018] The utility model discloses a pressure-regulating built-in relief valve with a simple and reasonable structure. A screw plug which is threadedly connected to the end of the screw sleeve is arranged on the outer side of the pressure-regulating screw, so that the pressure-regulating structure is built into the screw sleeve, thereby avoiding exposure of the pressure-regulating structure, thereby effectively preventing accidental touch during use of the relief valve, and ensuring the reliability of the set pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of an embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0021] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0022] Figure 4 yes Figure 2 Enlarged view of middle part B;

[0023] Figure 5 yes Figure 2 Three-dimensional structural diagram of the middle pressure adjusting screw.

[0024] The names of the reference numerals in the accompanying drawings of the present utility model are:

[0025] Valve sleeve 1, oil inlet 1a, oil return port 1b, screw sleeve 2, valve core 3, axial blind hole 3a, radial hole 3b, conical surface 3c, assembly groove 3d, second spring assembly part 31, pressure regulating screw 4, straight groove 4a, through hole 4b, first hexagon socket 4c, locking screw 41, first spring assembly part 42, spring 5, screw plug 6, second hexagon socket 6a, sealing ring 71, retaining ring 72. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below with reference to the accompanying drawings:

[0027] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be used for other implementation schemes, variations, improvements, equivalent schemes, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0028] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] like Figures 1 to 5 As shown, a pressure-regulating built-in overflow valve comprises a valve sleeve 1 and a screw sleeve 2 which are screwed together, a valve core 3 is arranged in the valve sleeve 1, an oil inlet 1a and an oil return port 1b are arranged on the valve sleeve 1, a pressure-regulating screw 4 is arranged in the screw sleeve 2, a spring 5 is arranged between the pressure-regulating screw 4 and the valve core 3, and a screw plug 6 which is screwed together with the end of the screw sleeve 2 is arranged on the outer side of the pressure-regulating screw 4.

[0031] The pressure-adjusting screw 4 is provided with a straight groove 4a, and a locking screw 41 is eccentrically provided on the pressure-adjusting screw 4 at a position corresponding to the straight groove 4a.

[0032] The depth of the straight groove 4a is greater than the radius of the pressure-adjusting screw 4. This arrangement can increase the deformation of the pressure-adjusting screw 4, thereby making the axial positioning more reliable.

[0033] The pressure-adjusting screw 4 is axially provided with a through hole 4b penetrating the pressure-adjusting screw 4 .

[0034] The valve core 3 is provided with an axial blind hole 3a and a radial hole 3b which are communicated with each other.

[0035] The pressure regulating screw 4 is provided with a first spring assembly portion 42, the valve core 3 is provided with a second spring assembly portion 31, one end of the spring 5 is sleeved outside the first spring assembly portion 42, and the other end is sleeved outside the second spring assembly portion 31. The provision of the first spring assembly portion 42 and the second spring assembly portion 31 facilitates the assembly of the spring 5 and can also prevent the displacement of the spring 5.

[0036] The oil inlet 1a is arranged axially, and the oil return port 1b is arranged radially.

[0037] The end of the valve core 3 is provided with a conical surface 3c.

[0038] The pressure regulating screw 4 is provided with a first inner hexagon socket 4c, and the screw plug 6 is provided with a second inner hexagon socket 6a.

[0039] The outer periphery of the valve core 3 is provided with an assembly groove 3d, and a sealing ring 71 and a retaining ring 72 are embedded in the assembly groove 3d. In the overflow valve of the utility model, the outer circle of the valve core 3 is matched with the inner hole of the valve sleeve 1, and the assembly groove 3d is provided on the outer periphery of the valve core 3. While the sealing ring 71 and the retaining ring 72 form a sealing structure, the sealing ring 71 is used to increase the friction force when the valve core 3 moves, thereby increasing the movement damping of the valve core 3, thereby reducing the vibration when the valve core 3 is opened. The problem that the existing overflow valve core is prone to vibration when it is opened, resulting in unstable overflow pressure and noise, is overcome.

[0040] Working principle:

[0041] The relief valve of the utility model is a threaded plug-in two-way structure, that is, it has two working oil ports, the front end face is the oil inlet 1a, and the side face is the oil return port 1b. The two working oil ports are separated by a sealing structure (O-ring and retaining ring). The outer circle of the left end of the valve sleeve 1 is an external thread, and the right end is a stepped outer circle. A sealing ring groove is provided in the front section, and the rear part of the groove is the oil inlet 1a. A valve core 3 is provided inside the valve sleeve 1, and the cone surface 3c at the right end of the valve core 3 abuts on the step inside the valve sleeve 1, and the middle outer circle matches the inner hole at the left end of the valve sleeve 1. An assembly groove 3d is provided on the middle outer circle, and the interior is an axial blind hole 3a, which is connected to the radial hole 3b. The rear part of the valve sleeve 1 is a screw sleeve 2, and the right end of the screw sleeve 2 is provided with an external thread, and the interior is provided with an internal thread, which is connected to the external thread of the valve sleeve 1. The left end of the screw sleeve 2 is screwed with a screw plug 6, which is provided with an external thread and an external limit step, and in the middle is a second internal hexagon 6a, whose external thread is connected to the internal thread of the left end of the screw sleeve 2. The screw sleeve 2 is provided with a pressure regulating screw 4 and a spring 5, and the spring 5 is provided between the pressure regulating screw 4 and the valve core 3. The pressure regulating screw 4 and the spring 5 constitute a pressure regulating structure. Since the left end of the screw sleeve 2 is blocked by the screw plug 6, the built-in pressure regulating structure is realized, which can effectively avoid accidental touch and ensure the reliability of the set pressure.

[0042] The initial state of this overflow valve is as follows Figure 2 As shown, the spring 5 of the overflow valve is in a pre-compression state, that is, it has been set at a certain pressure value. Under the action of the compression force of the spring 5, the valve core 3 is pressed to the right on the step end face of the inner hole of the valve sleeve 1, forming a sealing point between the valve core 3 and the valve sleeve 1, which is usually called the valve port. During normal operation, the pressure oil enters from the oil inlet 1a and acts on the conical surface 3c of the valve core 3. Compared with the pre-compression force of the spring 5, when the oil pressure is less than the pre-compression force of the spring 5, the valve core 3 is pressed tightly against the inner hole end face of the valve sleeve 1, and the oil inlet 1a and the oil return port 1b are blocked. When the oil pressure at the oil inlet 1a is greater than the pre-compression force of the spring 5, the valve core 3 is pushed to the left from the inner hole end face of the valve sleeve 1, opening the valve port, connecting the oil inlet 1a and the oil return port 1b, and the valve core 3 moves to the left, compressing the spring 5 until the oil pressure and the compression force of the spring 5 are balanced.

[0043] A second hexagon socket 6a is provided on the screw plug 6. When adjusting the pressure, it is necessary to first remove the screw plug 6 with an hexagon socket wrench, and then use the first hexagon socket 4c provided on the pressure-adjusting screw 4 to rotate the pressure-adjusting screw 4 with an hexagon socket wrench, thereby compressing or relaxing the spring 5 to achieve the purpose of adjusting the set pressure.

[0044] In addition, it is worth noting that in order to ensure the reliability of the set pressure, such as Figure 5As shown, the pressure-adjusting screw 4 is provided with a straight groove 4a, which divides the thread on the pressure-adjusting screw 4 into two sections. When the locking screw 41 is not tightened, the two sections of the thread form a thread pair, and the pressure-adjusting screw 4 can rotate smoothly in the screw sleeve 2; after the pressure adjustment is completed, the locking screw 41 is tightened. As the locking screw 41 is screwed in, the two ends of the pressure-adjusting screw 4 divided by the straight groove 4a are deformed, so that the gap between the mating surfaces of the thread pair is eliminated, that is, the thread pair is destroyed, thereby limiting the rotation of the pressure-adjusting screw 4, and then realizing the axial positioning of the pressure-adjusting screw 4. In other words, before performing the pressure adjustment operation, it is necessary to loosen the locking screw 41 first so that the pressure-adjusting screw 4 can rotate smoothly.

[0045] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A pressure regulating internal relief valve, comprising a valve sleeve (1) and a screw sleeve (2) which are screwed together, a valve core (3) being arranged in the valve sleeve (1), and an oil inlet (1a) and an oil return port (1b) being arranged on the valve sleeve (1), wherein: A pressure regulating screw (4) is arranged inside the screw sleeve (2), a spring (5) is arranged between the pressure regulating screw (4) and the valve core (3), and a screw plug (6) is arranged on the outer side of the pressure regulating screw (4) and is threadedly connected to the end of the screw sleeve (2).

2. The pressure regulating built-in overflow valve according to claim 1 is characterized in that: The pressure regulating screw (4) is provided with a straight groove (4a), and a locking screw (41) is eccentrically provided on the pressure regulating screw (4) corresponding to the position of the straight groove (4a).

3. The pressure regulating built-in overflow valve according to claim 2 is characterized in that: The depth of the straight groove (4a) is greater than the radius of the pressure regulating screw (4).

4. The pressure regulating built-in overflow valve according to claim 3 is characterized in that: The pressure regulating screw (4) is axially provided with a through hole (4b) penetrating the pressure regulating screw (4).

5. The pressure regulating built-in overflow valve according to claim 4 is characterized in that: The valve core (3) is provided with an axial blind hole (3a) and a radial hole (3b) which are communicated with each other.

6. A pressure regulating built-in overflow valve according to any one of claims 1 to 5, characterized in that: The pressure regulating screw (4) is provided with a first spring assembly portion (42), the valve core (3) is provided with a second spring assembly portion (31), one end of the spring (5) is sleeved outside the first spring assembly portion (42), and the other end thereof is sleeved outside the second spring assembly portion (31).

7. The pressure regulating built-in overflow valve according to claim 6 is characterized in that: The oil inlet (1a) is arranged axially, and the oil return port (1b) is arranged radially.

8. The pressure regulating built-in overflow valve according to claim 7 is characterized in that: The end of the valve core (3) is provided with a conical surface (3c).

9. The pressure regulating built-in relief valve according to claim 8 is characterized in that: The pressure regulating screw (4) is provided with a first inner hexagon socket (4c), and the screw plug (6) is provided with a second inner hexagon socket (6a).

10. The pressure regulating built-in overflow valve according to claim 9, characterized in that: The outer periphery of the valve core (3) is provided with an assembly groove (3d), and a sealing ring (71) and a retaining ring (72) are embedded in the assembly groove (3d).

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