Direct-acting pressure reducing valve

Abstract

The utility model 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] This utility model relates to a direct-acting pressure reducing valve, belonging to the technical field of pressure reducing valves. Background Technology

[0002] Pressure reducing valves are important hydraulic components widely used in the hydraulic machinery industry to ensure stable pressure throughout the hydraulic system. Pressure reducing valves can be classified by structure into direct-acting and pilot-operated types, and by adjustment requirements into constant-pressure reducing valves, differential-pressure reducing valves, and proportional-pressure reducing valves. They control the inlet and outlet pressures through throttling, ensuring the safe and orderly operation of the hydraulic system. Market research has found that most existing pressure reducing valves are high-pressure reducing valves, offering a wide pressure adjustment range but with complex structures.

[0003] For example, Chinese patent document CN104632742A discloses a direct-acting pressure reducing valve, including a valve body. A first pressure port and a second pressure port are provided on the side of the valve body. The lower cylindrical shoulder of the valve core forms a normally open valve port that is connected to the first pressure port with the valve hole. An oil drain port connected to the valve core is provided on the side of the upper cover. The oil can be returned to the oil tank through the oil drain port, making it more convenient to use. At the same time, an adjusting screw is provided on the top of the spring seat. This allows the preload of the pressure regulating spring to be changed according to actual needs, so as to meet different usage requirements.

[0004] However, this pressure reducing valve also 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, it is necessary to seal the joints between the valve body and the upper cover, and between the valve body and the lower cover, which will increase the manufacturing cost of the pressure reducing valve.

[0006] Secondly, processing the top cover, valve body, and bottom cover separately will greatly extend the processing time of the entire valve body and significantly increase the manufacturing cost of the pressure reducing valve.

[0007] Third, it is inconvenient to remove parts such as the valve core and pressure regulating spring from the pressure reducing valve for repair or replacement. Utility Model Content

[0008] To solve the above-mentioned technical problems, this utility model provides a direct-acting pressure reducing valve.

[0009] This utility model is achieved through the following technical solution:

[0010] A direct-acting pressure reducing valve includes a valve body, a valve core, a pressure regulating spring, and a baffle. The valve body has a valve hole, which is a blind hole. The valve body has a control port, an oil outlet, an oil inlet, a first oil discharge port, and a second oil discharge port that are connected to the valve hole in sequence. The valve body also has an oil passage that connects the oil outlet and the control port. The valve core is located inside the valve hole and is slidably connected to it. The baffle is located inside the second oil discharge port. The pressure regulating spring is fitted onto the valve core, and one end of the spring abuts against the baffle.

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

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

[0013] The first unloading port is also connected to the top surface of the valve body.

[0014] The end of the valve core away from the baffle rests against the side of the control 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 support section. One end of the support section is connected to one end of the pressure regulating section through an oil passage section. The other end of the support section is coaxially provided with a spring mounting section. The end of the pressure regulating section away from the support section is coaxially provided with a pushing section.

[0016] The shape and size of the pressure regulating section and the support section are adapted to the shape and size of the valve orifice;

[0017] The pressure regulating section is slidably connected to the valve orifice 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 outlet.

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

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

[0021] The pressure regulating spring is mounted on the spring mounting section, with one end extending into the first oil discharge port, the middle part located in the valve hole section between the first oil discharge port and the second oil discharge port, and the other end extending into the second oil discharge port.

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

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. The valve orifice is a blind hole located on the valve body, which is manufactured as a single piece. Compared to existing technologies that process the valve body components (upper cover, body, and lower cover) separately, this significantly shortens the processing time, improves processing efficiency, and reduces the manufacturing cost of the pressure reducing valve. Furthermore, since there are no seams in the valve body, sealing at the seams is eliminated, further reducing manufacturing costs. Because the valve orifice is blind, the valve core and pressure regulating spring can be removed from the valve orifice after removing the baffle from the second unloading port for maintenance or replacement.

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

[0026] 3. A slot is provided at the upper end of the baffle. When it is necessary to remove the valve core and pressure regulating spring from the valve body, a flathead screwdriver or similar tool can be inserted into the slot, and then the baffle can be pushed downwards to quickly remove the baffle from the second oil discharge port.

[0027] 4. Pressure reducing valves have advantages such as compact structure, small space occupation, small spring stiffness, low inlet oil pressure, small pressure adjustment range, and simple valve body structure that is easy to process. They can ensure stable flow and pressure at the outlet and can be used in hydraulic branches for small-amplitude pressure reduction in situations where space is limited. Attached Figure Description

[0028] Figure 1 This is an exploded view of the present invention;

[0029] Figure 2 It is a structural diagram of the utility model;

[0030] Figure 3 This is a schematic diagram of the valve core of this utility model.

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

[0032] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0033] like Figures 1 to 3 As shown, the present invention discloses a direct-acting pressure reducing valve, comprising a valve body 1, a valve core 2, a pressure regulating spring 3, and a baffle 4. The valve body 1 has a valve hole 10, which is a blind hole. The valve body 1 has a control oil port 12, an oil outlet 13, an oil inlet 14, a first oil discharge port 15, and a second oil discharge port 16 connected to the valve hole 10 in sequence. The valve body 1 has an oil passage 11 connecting the oil outlet 13 and the control oil port 12. The valve core 2 is located inside the valve hole 10 and is slidably connected to the valve hole 10. The baffle 4 is located inside the second oil discharge port 16. The pressure regulating spring 3 is fitted 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 located on the valve body 1, and the valve body 1 is manufactured as a single piece. Compared with the existing technology where the upper cover, valve body, and lower cover of the valve body components are machined separately, this greatly shortens the machining time of the valve body 1, improves the machining efficiency of the valve body 1, and reduces the manufacturing cost of the pressure reducing valve. 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, further reducing the manufacturing cost of the pressure reducing valve. Because the valve hole 10 is a blind hole, after removing the baffle 4 from the second oil discharge port 16, the valve core 2 and the pressure regulating spring 3 can be removed from the valve hole 10 for maintenance or replacement.

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

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

[0036] The first unloading port 15 is also connected to the top surface of the valve body 1. By clamping and fixing the valve body 1 once, the machining work of its upper oil passage 11, control oil port 12, oil outlet 13, oil inlet 14, first unloading port 15 and second unloading port 16 can be completed, which significantly improves the machining 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 rests against the side of the control port 12 away from the outlet 13 under the action of the pressure regulating spring 3. The valve opening is changed by moving the valve core 2 left and right, and the pressure regulating spring 3 balances the hydraulic pressure to achieve the pressure regulating function. For pressure reduction with small pressure difference, by selecting a low-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 passage 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 pushing section 20.

[0039] The shape and size of the pressure regulating section 21 and the support section 23 are adapted to the shape and size of the valve orifice 10;

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

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

[0042] The diameter of the pushing section 20 is smaller than the diameter of the pressure regulating section 21, and it is located within the control oil port 12. For example... Figure 2 As shown, the diameter of the pushing 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 to the right against the force of the pressure regulating spring 3, so as to achieve the purpose of adjusting the opening of the pressure reducing valve.

[0043] The diameter of the oil passage section 22 is smaller than the diameter of the pressure regulating section 21 and the diameter of the support section 23. One end of the oil passage section 22 extends into 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 into the oil inlet 14. The gap between the oil passage section 22 and the valve hole 10 forms an oil passage channel.

[0044] The pressure regulating spring 3 is mounted on the spring mounting section 24, with one end extending into the first oil discharge port 15, the middle part located in the valve hole 10 section between the first oil discharge port 15 and the second oil discharge port 16, and the other end extending into the second oil discharge port 16.

[0045] The upper end of the baffle 4 has a slot 40. When it is necessary to remove the valve core 2 and the pressure regulating spring 3 inside the valve body 1, a tool such as a flathead screwdriver can be inserted into the slot 40, and then the baffle 4 can be pushed downwards to quickly remove the baffle 4 from the second oil discharge 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 port 12 away from the outlet port 13. At this time, the valve opening is at its maximum (e.g., Figure 2(As shown). P1 is the oil pressure at inlet 14, and P2 is the oil pressure at outlet 13. A hydraulic oil path is led out from outlet 13 through oil passage 11 and enters control port 12, acting on the left end of valve core 2 to generate a rightward thrust P2A on valve core 2. When the oil pressure P1 at inlet 14 is lower than the set pressure value, the force exerted by thrust P2A on valve core 2 is not greater than the spring force of pressure regulating spring 3. At this time, the valve opening is fully open, and the pressure reducing valve does not reduce pressure. When the oil pressure P1 at inlet 14 is higher than the set pressure value, the force exerted by thrust P2A on valve core 2 is greater than the spring force of pressure regulating spring 3. Valve core 2 moves to the right, the valve opening gradually decreases, the resistance of hydraulic oil flowing through the valve opening increases, and the oil pressure P2 at outlet 13 decreases until the force exerted by thrust P2A on valve core is balanced with the spring force. At this time, the pressure reducing valve reduces pressure.

Claims

1. A direct-acting pressure reducing valve, characterized in that: The valve body (1) includes a valve core (2), a pressure regulating spring (3), and a baffle (4). The valve body (1) has a valve hole (10), which is a blind hole. The valve body (1) has a control oil port (12), an oil outlet (13), an oil inlet (14), a first oil discharge port (15), and a second oil discharge port (16) connected to the valve hole (10) in sequence. The valve body (1) has an oil passage (11) connecting the oil outlet (13) and the control oil port (12). The valve core (2) is located inside the valve hole (10) and is slidably connected to the valve hole (10). The baffle (4) is located inside the second oil discharge port (16). The pressure regulating spring (3) is fitted 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 as described in 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 as described in claim 1, characterized in that: The oil passage (11), control oil port (12), oil outlet (13), oil inlet (14), first oil discharge port (15) and second oil discharge port (16) are all connected to the bottom surface of the valve body (1); The first unloading port (15) is also connected to the top surface of the valve body (1).

4. The direct-acting pressure reducing valve as described in claim 1, characterized in that: 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).

5. The direct-acting pressure reducing valve as described in claim 1, characterized in that: 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 passage 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 pushing section (20).

6. The direct-acting pressure reducing valve as described in claim 5, characterized in that: The shape and size of the pressure regulating section (21) and the support section (23) are adapted to the shape and size 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 the valve hole (10) section between the oil inlet (14) and the first oil outlet (15).

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

8. The direct-acting pressure reducing valve as described in claim 5, characterized in that: The diameter of the oil passage section (22) is smaller than the diameter of the pressure regulating section (21) and the diameter of the support section (23). One end of the oil passage section (22) extends into 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 into the oil inlet (14).

9. The direct-acting pressure reducing valve as described in claim 5, characterized in that: The pressure regulating spring (3) is mounted on the spring mounting section (24), with one end extending into the first unloading port (15), the middle part located in the valve hole (10) section between the first unloading port (15) and the second unloading port (16), and the other end extending into the second unloading port (16).

10. The direct-acting pressure reducing valve as described in claim 1, characterized in that: The upper end of the baffle (4) is provided with a slot (40).

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