Direct-acting pressure reducing valve

Abstract

The invention discloses a direct-acting pressure reducing valve, and belongs to the technical field of pressure reducing valves. The pressure reducing valve comprises a valve body, a valve element, a pressure adjusting spring and a baffle, a valve hole is formed in the valve body and is a blind hole, a control oil port, an oil outlet, an oil inlet, a first oil discharge port and a second oil discharge port which are communicated with the valve hole are sequentially formed in the valve body, an oil channel communicated with the oil outlet and the control oil port is formed in the valve body, and the valve element is arranged in the oil channel. The valve element is located in the valve hole and connected with the valve hole in a sliding mode, the baffle is located in the second oil discharging opening, the valve element is sleeved with the pressure adjusting spring, and one end of the pressure adjusting spring abuts against the baffle. The valve body is integrally machined, manufactured and formed, the machining time of the valve body is greatly shortened, the machining efficiency of the valve body is improved, and the manufacturing cost of the pressure reducing valve can be reduced. Due to the fact that the valve hole is a blind hole, after the baffle is taken out of the second oil discharging opening, the valve element and the pressure adjusting spring can be taken out of the valve hole, and the valve element and the pressure adjusting spring can be maintained or replaced conveniently.

Description

Technical Field

[0001] The invention relates to a direct-acting pressure reducing valve, belonging to the technical field of pressure reducing valves. Background Art

[0002] Pressure reducing valve is an important hydraulic component, widely used in hydraulic machinery industry, to ensure stable pressure in the whole hydraulic system. Pressure reducing valve can be divided into direct acting type and pilot type according to the structure, and can be divided into fixed value pressure reducing valve, fixed differential pressure reducing valve and fixed ratio pressure reducing valve according to the regulation requirements. It controls the inlet and outlet pressure by throttling to ensure the safe and orderly operation of the hydraulic system. According to market research, most of the existing pressure reducing valves are high-pressure pressure reducing valves, with a wide pressure regulation range but complex structure.

[0003] For example, a Chinese patent document with publication number CN104632742A discloses a direct-acting pressure reducing valve, including a valve body, a first pressure oil port and a second pressure oil port are arranged on the side of the valve body, the cylindrical shoulder at the lower end of the valve core and the valve hole form a normally open valve port which is through-connected with the first pressure oil port, and an oil drain port connected to the valve core is arranged on the side of the upper cover, through which the oil can return the oil to the oil tank, which is more convenient to use. At the same time, an adjusting screw is arranged on the top of the spring seat, so that the pre-pressure of the pressure regulating spring can be changed by adjusting the screw according to actual needs to meet different usage needs.

[0004] However, the pressure reducing valve still has the following shortcomings:

[0005] First, the valve body includes an upper cover, a lower cover, and a valve body located between the upper cover and the lower cover. Therefore, the joints between the valve body and the upper cover, and between the valve body and the lower cover need to be sealed, which increases the manufacturing cost of the pressure reducing valve.

[0006] Second, processing the upper cover, the valve body and the lower cover separately will greatly prolong the processing time of the entire valve body and significantly increase the manufacturing cost of the pressure reducing valve.

[0007] Third, it is not convenient to remove the valve core, pressure regulating spring and other parts from the pressure reducing valve for maintenance or replacement. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a direct-acting pressure reducing valve.

[0009] The present invention is achieved through the following technical solutions:

[0010] A direct-acting pressure reducing valve comprises a valve body, a valve core, a pressure regulating spring and a baffle, wherein a valve hole is provided on the valve body, and the valve hole is a blind hole, a control oil port, an oil outlet, an oil inlet, a first oil unloading port and a second oil unloading port which are connected to the valve hole are provided on the valve body in sequence, an oil passage which is connected to the oil outlet and the control oil port is provided on the valve body, the valve core is located in the valve hole and is slidably connected to the valve hole, the baffle is located in the second oil unloading port, the pressure regulating spring is sleeved on the valve core, and one end of the pressure regulating spring rests on the baffle.

[0011] The bottom surface of the valve hole is coplanar with the side surface of the control oil port away from the oil outlet.

[0012] The oil passage, the control oil port, the oil outlet, the oil inlet, the first oil unloading port and the second oil unloading port are all connected to the bottom surface of the valve body;

[0013] The first oil unloading port is also communicated with the top surface of the valve body.

[0014] One end of the valve core away from the baffle plate abuts against the side surface of the control oil port away from the oil outlet under the action of the pressure regulating spring.

[0015] The valve core includes a pressure regulating section and a supporting section, one end of the supporting section is connected to one end of the pressure regulating section through an oil passing section, the other end of the supporting section is coaxially provided with a spring mounting section, and the end of the pressure regulating section away from the supporting section is coaxially provided with a pushing section.

[0016] The shapes and sizes of the pressure regulating section and the supporting section are adapted to the shapes and sizes of the valve hole;

[0017] The pressure regulating section is slidably connected to the valve hole section between the control oil port and the oil outlet;

[0018] The support section is slidably connected to the valve hole section between the oil inlet and the first oil unloading port.

[0019] The diameter of the pushing section is smaller than the diameter of the pressure regulating section and is located in the control oil port.

[0020] The diameter of the oil passing section is smaller than the diameter of the pressure regulating section and the diameter of the supporting section. One end of the oil passing section extends to the oil outlet, the middle is located in the valve hole section between the oil outlet and the oil inlet, and the other end extends to the oil inlet.

[0021] The pressure regulating spring is sleeved on the spring installation section, one end of which extends into the first oil unloading port, the middle part is located in the valve hole section between the first oil unloading port and the second oil unloading port, and the other end extends into the second oil unloading port.

[0022] The upper end of the baffle is provided with a notch.

[0023] The beneficial effects of the present invention are:

[0024] 1. The valve hole is a blind hole set on the valve body, and the valve body is manufactured and formed by one-piece processing. Compared with the method of separately processing the upper cover, valve body body and lower cover of the valve body components in the prior art, the processing time of the valve body is greatly shortened, the processing efficiency of the valve body is improved, and the manufacturing cost of the pressure reducing valve can be reduced. At the same time, since there is no butt joint in the valve body, there is no need to consider the sealing problem at the butt joint, which further reduces the manufacturing cost of the pressure reducing valve. Since the valve hole is a blind hole, after removing the baffle from the second oil unloading port, the valve core and the pressure regulating spring can be removed from the valve hole for maintenance or replacement.

[0025] 2. The oil passage, control oil port, oil outlet, oil inlet, first oil unloading port and second oil unloading port are all connected to the bottom surface of the valve body; the processing of the oil passage, control oil port, oil outlet, oil inlet, first oil unloading port and second oil unloading port can be completed by clamping and fixing the valve body once, which significantly improves the processing efficiency of the valve body and helps to reduce the manufacturing cost of the pressure reducing valve.

[0026] 3. There is a notch on the upper end of the baffle. When the valve core and the pressure regulating spring in the valve body need to be removed, the end of a tool such as a flat-blade screwdriver can be inserted into the notch, and then the baffle can be pushed downward to quickly remove the baffle from the second oil unloading port.

[0027] 4. The pressure reducing valve has the advantages of compact structure, small space occupation, small spring stiffness, low oil inlet pressure, small pressure regulation range, simple valve body structure and easy processing. It can ensure the stability of oil outlet flow and pressure, and can be used in hydraulic branches for small pressure reduction in occasions where space is not large. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 An exploded view of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the valve core of the present invention.

[0031] In the figure: 1-valve body, 10-valve hole, 11-oil channel, 12-control oil port, 13-oil outlet, 14-oil inlet, 15-first oil unloading port, 16-second oil unloading port, 2-valve core, 20-pushing section, 21-pressure regulating section, 22-oil passing section, 23-support section, 24-spring installation section, 3-pressure regulating spring, 4-baffle, 40-slot. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0033] like Figures 1 to 3As shown, a direct-acting pressure reducing valve described in the present invention includes a valve body 1, a valve core 2, a pressure regulating spring 3 and a baffle 4. The valve body 1 is provided with a valve hole 10, and the valve hole 10 is a blind hole. The valve body 1 is provided with a control oil port 12, an oil outlet 13, an oil inlet 14, a first oil unloading port 15 and a second oil unloading port 16 which are connected to the valve hole 10 in sequence. The valve body 1 is provided with an oil passage 11 which is connected to the oil outlet 13 and the control oil port 12. The valve core 2 is located in the valve hole 10 and is slidably connected to the valve hole 10. The baffle 4 is located in the second oil unloading port 16. The pressure regulating spring 3 is sleeved on the valve core 2, and one end of the pressure regulating spring 3 abuts against the baffle 4. The valve hole 10 is a blind hole provided on the valve body 1, and the valve body 1 is formed by integrated processing. Compared with the method of separately processing the upper cover, the valve body body and the lower cover of the valve body components in the prior art, the processing time of the valve body 1 is greatly shortened, the processing efficiency of the valve body 1 is improved, and the manufacturing cost of the pressure reducing valve can be reduced. At the same time, since there is no butt joint in the valve body 1, there is no need to consider the sealing problem at the butt joint, which further reduces the manufacturing cost of the pressure reducing valve. Since the valve hole 10 is a blind hole, after taking out the baffle 4 from the second oil unloading port 16, the valve core 2 and the pressure regulating spring 3 can be taken out from the valve hole 10 so as to repair or replace them.

[0034] The bottom surface of the valve hole 10 is coplanar with the side surface of the control oil port 12 away from the oil outlet 13 .

[0035] The oil passage 11, the control oil port 12, the oil outlet 13, the oil inlet 14, the first oil unloading port 15 and the second oil unloading port 16 are all connected to the bottom surface of the valve body 1;

[0036] The first oil unloading port 15 is also connected to the top surface of the valve body 1. The valve body 1 is clamped and fixed once, and the processing of the upper oil passage 11, the control oil port 12, the oil outlet 13, the oil inlet 14, the first oil unloading port 15 and the second oil unloading port 16 can be completed, which significantly improves the processing efficiency of the valve body 1 and helps to reduce the manufacturing cost of the pressure reducing valve.

[0037] The end of the valve core 2 away from the baffle 4 abuts against the side of the control oil port 12 away from the oil outlet 13 under the action of the pressure regulating spring 3. The valve core 2 moves left and right to change the valve port opening, and the pressure regulating spring 3 balances the hydraulic pressure to achieve the pressure regulating effect. For the pressure reduction of small pressure difference, by selecting a small stiffness pressure regulating spring 3, the pressure regulating range can be narrowed and the pressure regulating sensitivity can be increased.

[0038] The valve core 2 includes a pressure regulating section 21 and a support section 23. One end of the support section 23 is connected to one end of the pressure regulating section 21 through an oil passing section 22. The other end of the support section 23 is coaxially provided with a spring mounting section 24. The end of the pressure regulating section 21 away from the support section 23 is coaxially provided with a push section 20.

[0039] The shapes and sizes of the pressure regulating section 21 and the supporting section 23 are adapted to the shapes and sizes of the valve hole 10;

[0040] The pressure regulating section 21 is slidably connected to the valve hole 10 section between the control oil port 12 and the oil outlet 13;

[0041] The support section 23 is slidably connected to a section of the valve hole 10 between the oil inlet 14 and the first oil unloading port 15 .

[0042] The diameter of the push section 20 is smaller than the diameter of the pressure regulating section 21 and is located in the control oil port 12. Figure 2 As shown, the diameter of the push section 20 is smaller than the diameter of the pressure regulating section 21, so that the hydraulic oil entering the control oil port 12 can push the valve core 2 to move rightward to overcome the force of the pressure regulating spring 3, so as to achieve the purpose of adjusting the valve port opening of the pressure reducing valve.

[0043] The diameter of the oil passing section 22 is smaller than the diameter of the pressure regulating section 21 and the diameter of the supporting section 23. One end of the oil passing section 22 extends to the oil outlet 13, the middle part is located in the valve hole 10 section between the oil outlet 13 and the oil inlet 14, and the other end extends to the oil inlet 14. The gap between the oil passing section 22 and the valve hole 10 forms an oil passing channel.

[0044] The pressure regulating spring 3 is sleeved on the spring mounting section 24 , one end of which extends into the first oil unloading port 15 , the middle part of which is located in the valve hole 10 section between the first oil unloading port 15 and the second oil unloading port 16 , and the other end of which extends into the second oil unloading port 16 .

[0045] The upper end of the baffle plate 4 is provided with a notch 40. When the valve core 2 and the pressure regulating spring 3 in the valve body 1 need to be removed, a tool head such as a flat-blade screwdriver can be inserted into the notch 40, and then the baffle plate 4 is pushed downward to quickly remove the baffle plate 4 from the second oil unloading port 16.

[0046] Specifically, after the pressure reducing valve is installed on the valve seat, in the initial state, the valve core 2 is located at the leftmost end under the spring force of the pressure regulating spring 3, that is, the valve core 2 abuts against the side of the control oil port 12 away from the oil outlet 13, and the valve opening is the largest (such as Figure 2As shown). P1 is the oil pressure at the oil inlet 14, and P2 is the oil pressure at the oil outlet 13. A path of hydraulic oil is drawn from the oil outlet 13 through the oil passage 11 into the control oil port 12 to act on the left end of the valve core 2, so as to generate a rightward thrust P2A on the valve core 2. When the oil pressure P1 at the oil inlet 14 is lower than the set pressure value, the force exerted by the thrust P2A on the valve core 2 is not greater than the spring force of the pressure regulating spring 3. At this time, the valve opening is fully open, and the pressure reducing valve does not have a pressure reducing effect; when the oil pressure P1 at the oil inlet 14 is higher than the set pressure value, the force exerted by the thrust P2A on the valve core 2 is greater than the spring force of the pressure regulating spring 3, the valve core 2 moves to the right, the valve opening gradually decreases, the resistance of the hydraulic oil flowing through the valve port increases, and the oil pressure P2 at the oil outlet 13 decreases until the force exerted by the thrust P2A on the valve core is balanced with the spring force, at which time the pressure reducing valve has a pressure reducing effect.

Claims

1. A direct-acting pressure reducing valve, characterized in that: The invention comprises a valve body (1), a valve core (2), a pressure regulating spring (3) and a baffle (4); the valve body (1) is provided with a valve hole (10), and the valve hole (10) is a blind hole; the valve body (1) is provided with a control oil port (12), an oil outlet (13), an oil inlet (14), a first oil unloading port (15) and a second oil unloading port (16) which are connected to the valve hole (10) in sequence; the valve body (1) is provided with an oil passage (11) which is connected to the oil outlet (13) and the control oil port (12); the valve core (2) is located in the valve hole (10) and is slidably connected to the valve hole (10); the baffle (4) is located in the second oil unloading port (16); the pressure regulating spring (3) is sleeved on the valve core (2), and one end of the pressure regulating spring (3) abuts against the baffle (4).

2. The direct-acting pressure reducing valve according to claim 1, characterized in that: The bottom surface of the valve hole (10) is coplanar with the side surface of the control oil port (12) away from the oil outlet (13).

3. The direct-acting pressure reducing valve according to claim 1, characterized in that: The oil passage (11), the control oil port (12), the oil outlet (13), the oil inlet (14), the first oil discharge port (15) and the second oil discharge port (16) are all in communication with the bottom surface of the valve body (1); The first oil unloading port (15) is also in communication with the top surface of the valve body (1).

4. The direct-acting pressure reducing valve according to claim 1, characterized in that: Under the action of the pressure regulating spring (3), one end of the valve core (2) away from the baffle (4) abuts against the side surface of the control oil port (12) away from the oil outlet (13).

5. The direct-acting pressure reducing valve according to claim 1, characterized in that: The valve core (2) comprises a pressure regulating section (21) and a support section (23); one end of the support section (23) is connected to one end of the pressure regulating section (21) via an oil passing section (22); the other end of the support section (23) is coaxially provided with a spring mounting section (24); and the end of the pressure regulating section (21) away from the support section (23) is coaxially provided with a push section (20).

6. The direct-acting pressure reducing valve according to claim 5, characterized in that: The shapes and sizes of the pressure regulating section (21) and the supporting section (23) are compatible with the shapes and sizes of the valve hole (10); The pressure regulating section (21) is slidably connected to the valve hole (10) section between the control oil port (12) and the oil outlet (13); The support section (23) is slidably connected to a valve hole (10) section between the oil inlet (14) and the first oil discharge port (15).

7. The direct-acting pressure reducing valve according to claim 5, characterized in that: The diameter of the pushing section (20) is smaller than the diameter of the pressure regulating section (21), and is located in the control oil port (12).

8. The direct-acting pressure reducing valve according to claim 5, characterized in that: The diameter of the oil-passing section (22) is smaller than the diameter of the pressure-regulating section (21) and the diameter of the supporting section (23); one end of the oil-passing section (22) extends into the oil outlet (13); the middle portion is located in the valve hole (10) section between the oil outlet (13) and the oil inlet (14); and the other end extends into the oil inlet (14).

9. The direct-acting pressure reducing valve according to claim 5, characterized in that: The pressure regulating spring (3) is sleeved on the spring mounting section (24), one end of which extends into the first oil unloading port (15), the middle portion of which is located in the valve hole (10) section between the first oil unloading port (15) and the second oil unloading port (16), and the other end of which extends into the second oil unloading port (16).

10. The direct-acting pressure reducing valve according to claim 1, characterized in that: A notch (40) is formed at the upper end of the baffle (4).

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