Integrated flow pressure control valve

Abstract

The invention discloses an integrated flow pressure control valve which comprises a valve block, a counter bore is vertically and inwards formed in one end face of the valve block, a lower valve body, a middle valve body and an upper valve body are sequentially installed in the counter bore from inside to outside, a valve element A is installed in the lower valve body, and a valve element B and a feedback rod are sequentially installed in a through hole of the middle valve body from bottom to top. The upper end of the feedback rod is located in the upper valve body, the end of the feedback rod is sleeved with a spring A, the spring A is locked and fixed to the upper valve body through an adjusting screw, a spring C is arranged between the bottom of the valve element A and the bottom of a counter bore of the valve block, a spring B is arranged between the valve element B and the lower valve body, an inlet is formed in the lower end of the valve block, and an outlet is formed in the middle of the valve block. And the air passes through a channel A, a channel B, a channel C, a channel D, a channel E, a channel F, a channel G and a channel H in sequence and is finally discharged from an outlet. The invention has the advantages of compact structure, small volume, simple part processing, high control precision, easy adjustment, stable pressure flow and high reliable output.

Description

Technical Field

[0001] The present invention relates to a control valve, in particular to an integrated flow and pressure control valve. Background Art

[0002] A flow and pressure control valve is a component that plays a constant pressure overflow role in a hydraulic system. By controlling the pressure and flow rate of the liquid flow, it meets the requirements put forward by the actuator, and plays a role in stabilizing pressure, unloading the system and safety protection. The common structures of current flow and pressure control valves are as recorded in patent documents CN1293313C and CN105114665A. These flow and pressure control valves are generally applied to construction machinery, so the overall volume is relatively large. The flow and pressure control valves with a large volume cannot meet the usage requirements on aerospace equipment. Moreover, the flow and pressure control valves used on aerospace equipment are also required to have characteristics such as high control accuracy, easy adjustment, stable pressure and flow, and high-reliability output. However, these are all beyond the reach of current flow and pressure control valves. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated flow and pressure control valve. The control valve of the present invention has the advantages of a compact structure, small volume, relatively simple part processing, high control accuracy, easy adjustment, stable pressure and flow, and high-reliability output.

[0004] The technical solution of the present invention: An integrated flow and pressure control valve includes a valve block. A counterbore is vertically provided inward from one end face of the valve block. A lower valve body, a middle valve body and an upper valve body are sequentially installed in the counterbore from inside to outside. A spool A is installed in the lower valve body. A spool B and a feedback rod are sequentially installed in the through hole of the middle valve body from bottom to top. The upper end of the feedback rod is located in the upper valve body, and a spring A is sleeved on the end of the feedback rod. The spring A is locked and fixed on the upper valve body by an adjusting screw. A spring C is arranged between the bottom of the spool A and the bottom of the counterbore of the valve block. A spring B is arranged between the spool B and the lower valve body. An inlet is provided at the lower end of the valve block, and an outlet is provided in the middle. Among them, a channel A and a channel C are respectively arranged horizontally and vertically on the lower valve body. Channels B and D are respectively arranged in the spool A and the spool B. A channel E is formed between the upper end of the spool B and the inner hole wall of the middle valve body. A channel F is formed between the lower end of the feedback rod and the inner hole wall of the middle valve body. A channel G is arranged on the middle valve body, and a channel H is arranged on the upper valve body. The medium enters from the inlet and sequentially passes through the channel A, channel B, channel C, channel D, channel E, channel F, channel G, channel H, and finally exits from the outlet.

[0005] In the foregoing integrated flow and pressure control valve, when the spring B is not compressed, there is a gap between the bottom surface of the spool B and the top surface of the lower valve body, and this gap is the balance chamber A; when the spring C is not compressed, there is a gap between the bottom surface of the spool A and the bottom surface of the counterbore of the valve block, and this gap is the balance chamber B. The balance chamber A and the balance chamber B are communicated through a balance small hole on the spool A.

[0006] In the aforementioned integrated flow and pressure control valve, a sealing baffle is provided at the top end of the valve core B, the bottom of the feedback rod abuts against the top surface of the sealing baffle, and the channel E is of an inverted L-shaped structure, and its horizontal channel is located above the sealing baffle.

[0007] In the aforementioned integrated flow and pressure control valve, sealing rings are sleeved on the outer peripheries of the lower valve body, the middle valve body, the upper valve body, and the feedback rod.

[0008] In the aforementioned integrated flow and pressure control valve, an external thread is provided on the outer periphery of the upper end of the upper valve body, and an internal thread is provided at the upper end of the counterbore of the valve block, and the two are fixedly connected together by threads.

[0009] In the aforementioned integrated flow and pressure control valve, the adjusting screw is of a U-shaped structure, an external thread is provided on its outer wall, and an internal thread is provided in the inner hole of the upper valve body, and the two are fixedly connected together by threads.

[0010] In the aforementioned integrated flow and pressure control valve, the feedback rod is of a stepped structure with a large middle and small ends, the inner hole of the middle valve body is a stepped through hole with a small middle and large ends, and the lower stepped surface of the feedback rod is located above the upper stepped surface of the inner hole of the middle valve body, and there is a spacing between the two.

[0011] In the aforementioned integrated flow and pressure control valve, the bottom of the upper valve body forms a counterbore structure, and the top of the middle valve body forms a boss structure, and the boss structure is snapped into the counterbore structure.

[0012] In the aforementioned integrated flow and pressure control valve, counterbores are provided at the bottoms of the valve cores A and B and the top surface of the lower valve body.

[0013] Advantages of the present invention: Compared with the prior art, in the present invention, components such as upper, middle, and lower valve bodies, valve cores A and B, spring A, spring B, and spring C are provided in the valve block, so that the integrated flow and pressure control valve of the present invention forms two-stage modules: one stage is a flow-limiting and pressure-reducing module, and the second stage is a pressure stabilizing and regulating module. Under the control of the medium pressure and the elastic force of spring C, the required flow is controlled by controlling the opening degree of valve core A; the balance small hole can stabilize the opening degree of valve core A in the new stable state, so that the required flow is stably output; under the combined action of the medium pressure, spring A and spring B, the opening degree of valve core B is adjusted through the feedback rod to achieve the purpose of controlling the stable output of the required pressure, and at the same time, the output of the required pressure can also be adjusted through the adjusting screw. When the load pressure is higher than the output pressure, valve core B closes under the action of the medium pressure, spring A and spring B, and does not open again until the required output pressure is restored, playing an overload protection role at the same time.

[0014] Generally speaking, compared with the existing flow control valves, the integrated flow pressure control valve of the present invention has the advantages of compact structure, small volume, relatively simple part processing, high control precision, easy adjustment, stable pressure and flow, and high-reliability output. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the distribution of each channel.

[0016] Reference numerals: 1-valve block, 2-lower valve body, 3-middle valve body, 4-upper valve body, 5-spool A, 6-spool B, 7-feedback rod, 8-spring A, 9-adjusting screw, 10-spring C, 11-spring B, 12-inlet, 13-outlet, 14-channel A, 15-channel B, 16-channel C, 17-channel D, 18-channel E, 19-channel F, 20-channel G, 21-channel H, 22-balancing chamber A, 23-balancing chamber B, 24-balancing small hole, 25-sealing baffle, 26-sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further describes the present invention with reference to the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0018] Embodiment of the present invention: An integrated flow pressure control valve includes a valve block 1. There is a counterbore vertically inwardly provided on one end face of the valve block 1. A lower valve body 2, a middle valve body 3, and an upper valve body 4 are successively installed in the counterbore from the inside to the outside. Among them, a spool A 5 is installed in the lower valve body 2. A spool B 6 and a feedback rod 7 are successively installed in the through hole of the middle valve body 3 from the bottom to the top. The upper end of the feedback rod 7 is located in the upper valve body 4, and a spring A 8 is sleeved on its end. The spring A 8 is locked and fixed on the upper valve body 4 by an adjusting screw 9. A spring C 10 is provided between the bottom of the spool A 5 and the bottom of the counterbore of the valve block 1. A spring B 11 is provided between the spool B 6 and the lower valve body 2. An inlet 12 is provided at the lower end of the valve block 1, and an outlet 13 is provided in the middle. Among them, a channel A 14 and a channel C 16 are respectively provided horizontally and vertically in the lower valve body 2. Channels B 15 and D 17 are respectively provided in the spool A 5 and the spool B 6. A channel E 18 is formed between the upper end of the spool B 6 and the inner hole wall of the middle valve body 3. A channel F 19 is formed between the lower end of the feedback rod 7 and the inner hole wall of the middle valve body 3. A channel G 20 is provided on the middle valve body 3, and a channel H 21 is provided on the upper valve body 4. The medium enters from the inlet 12 and successively passes through the channel A 14, the channel B 15, the channel C 16, the channel D 17, the channel E 18, the channel F 19, the channel G 20, the channel H 21, and finally exits from the outlet 13.

[0019] When the spring B11 is not compressed, there is a gap between the bottom surface of the valve core B6 and the top surface of the lower valve body 2, and this gap is the balance chamber A22; when the spring C10 is not compressed, there is a gap between the bottom surface of the valve core A5 and the bottom surface of the counterbore of the valve block 1, and this gap is the balance chamber B23. The balance chamber A22 and the balance chamber B23 are communicated through the balance small hole 24 on the valve core A5. During the use process, as the valve core A5 and the valve core B6 move, the sizes of the balance chamber A22 and the balance chamber B23 will change. The function of the balance small hole 24 is to stabilize the opening degree of the valve core A5 in the new stable state, so as to stably output the required flow rate.

[0020] A sealing baffle 25 is fixedly arranged at the top end of the valve core B6. Combining Figure 1 it can be known that the inner hole of the middle valve body 3 is a multi-stage stepped inner hole structure, and the size of the bottom inner hole where the valve core B6 is located is the largest. When the top of the sealing baffle 25 abuts against the top surface of the mounting hole of the middle valve body 3, the opening degree of the valve core B6 is zero at this time, and the channel is cut off, and the medium cannot pass through. The bottom of the feedback rod 7 abuts against the top surface of the sealing baffle 25. When the feedback rod 7 moves downward, it can push the valve core B6 to move downward, so that the opening degree of the valve core B6 increases and the channel is communicated. The channel E18 is an inverted L-shaped structure, and its horizontal channel is located above the sealing baffle 25. When the medium enters the position of the channel E18, the medium will act on the top of the sealing baffle 25, thereby generating a downward pressure on the valve core B6, causing the valve core B6 to move downward, and the channel E18 and the channel F19 are communicated.

[0021] Sealing rings 26 are sleeved on the outer peripheries of the lower valve body 2, the middle valve body 3, the upper valve body 4 and the feedback rod 7 to achieve sealing and prevent the medium from leaking out of the gaps between adjacent parts.

[0022] External threads are arranged on the outer periphery of the upper end of the upper valve body 4, and internal threads are arranged at the upper end of the counterbore of the valve block 1. The two are fixedly connected together by threads. After other components are installed into the counterbore of the valve block 1, the upper valve body 4 is finally screwed in by threads, and other components can be locked and fixed. The installation and disassembly are both relatively convenient.

[0023] The adjusting screw 9 is of a U-shaped structure, which is convenient for installing the spring A8 into it, so as to realize the limit of the spring A8. External threads are arranged on the outer wall of the adjusting screw 9, and internal threads are arranged on the inner hole of the upper valve body 4. The two are fixedly connected together by threads. By rotating the adjusting screw 9, the pressure of the adjusting screw 9 on the spring A8 can be changed, so as to change the elastic force of the spring A8 on the feedback rod 7, and finally cause the opening degree of the valve core B6 to change.

[0024] The feedback rod 7 has a stepped structure with a larger middle part and smaller ends. The small end at the top of the feedback rod 7 extends into the spring A8, and the bottom of the spring A8 is supported on the upper stepped surface of the feedback rod 7, thereby realizing the limit fixation of the spring A8. The inner hole of the middle valve body 3 is a stepped through-hole with a smaller middle part and larger ends. The small end at the lower part of the feedback rod 7 extends into the middle inner hole of the middle valve body 3, and the diameter of the small end at the lower part of the feedback rod 7 is smaller than the middle inner hole of the middle valve body 3, so that the gap between the two forms a channel F19 to facilitate the passage of the medium. The lower stepped surface of the feedback rod 7 is above the upper stepped surface of the inner hole of the middle valve body 3, and there is a distance between the two, and this distance is variable. By screwing in the adjusting screw 9 inward, the adjusting screw 9 compresses the spring A8, increasing the elastic force of the spring A8. The elastic force of the spring will push the feedback rod 7 downward, and the head end of the feedback rod 7 will push the sealing baffle 25 downward, increasing the opening degree of the valve core B6. When the feedback rod 7 moves downward, the distance between the lower stepped surface of the feedback rod 7 and the upper stepped surface of the inner hole of the middle valve body 3 decreases. When the two stepped surfaces come into contact, the feedback rod 7 can no longer move downward, and the opening degree of the valve core B6 is adjusted to the maximum.

[0025] The bottom of the upper valve body 4 forms a counterbore structure, and the top of the middle valve body 3 forms a boss structure. The boss structure is clamped into the counterbore structure, and this structure can realize the mutual limit fixation between components and ensure the assembly accuracy.

[0026] Counterbores are provided on the bottoms of the valve core A5 and the valve core B6 and the top surface of the lower valve body 2. The counterbore of the valve core A5 is used to place the spring C10, and the counterbores on the valve core B6 and the lower valve body 2 are used to place the spring B11, and the limit of the spring is realized through the counterbore.

[0027] An integrated flow and pressure control valve of the present invention consists of two-stage modules: the first stage is a flow-limiting and pressure-reducing module, which is composed of the lower valve body 2, the valve core A5, and the spring C10; the second stage is a pressure stabilizing and regulating module, which is composed of the components above the upper valve body 2. This control valve is in an open state all the time, and its working principle is as follows: when the working medium with a certain pressure enters the first-stage module from the inlet, under the control action of the medium pressure and the elastic force of the spring C10, the opening degree of the valve core A5 is controlled, so as to adjust the pressure difference between the inlet and outlet of the valve to reach the set value, thereby realizing the control of the required flow rate. The function of the balance orifice 24 is to stabilize the opening degree of the valve core A5 in the new stable state, so as to stably output the required flow rate. At the same time, after passing through the first-stage module, the pressure will be reduced to a new pressure and then enter the second-stage module. Under the action of the medium pressure, the spring A8 and the spring B11, the opening degree of the valve core A5 is adjusted through the feedback rod 7, so as to achieve the purpose of controlling the stable output of the required pressure. At the same time, the output of the required pressure can also be adjusted through the adjusting screw 9. When the load pressure is higher than the output pressure, the valve core B6 closes under the action of the medium pressure, the spring A8 and the spring B11, and will not open again until the required output pressure is restored, playing an overload protection role at the same time.

Claims

1. An integrated flow pressure control valve, characterized in that: It includes a valve block (1). There is a counterbore vertically inward on one end face of the valve block (1). A lower valve body (2), a middle valve body (3), and an upper valve body (4) are successively installed in the counterbore from the inside to the outside. Among them, a spool A (5) is installed in the lower valve body (2). A spool B (6) and a feedback rod (7) are successively installed in the through hole of the middle valve body (3) from bottom to top. The upper end of the feedback rod (7) is located in the upper valve body (4), and a spring A (8) is sleeved on its end. The spring A (8) is locked and fixed on the upper valve body (4) through an adjusting screw (9). A spring C (10) is arranged between the bottom of the spool A (5) and the bottom of the counterbore of the valve block (1). A spring B (11) is arranged between the spool B (6) and the lower valve body (2). An inlet (12) is provided at the lower end of the valve block (1), and an outlet (13) is provided in the middle. Among them, a channel A (14) and a channel C (16) are respectively arranged horizontally and vertically on the lower valve body (2). Channels B (15) and D (17) are respectively arranged in the spool A (5) and the spool B (6). A channel E (18) is formed between the upper end of the spool B (6) and the inner hole wall of the middle valve body (3). A channel F (19) is formed between the lower end of the feedback rod (7) and the inner hole wall of the middle valve body (3). A channel G (20) is arranged on the middle valve body (3), and a channel H (21) is arranged on the upper valve body (4). The medium enters from the inlet (12) and successively passes through the channel A (14), the channel B (15), the channel C (16), the channel D (17), the channel E (18), the channel F (19), the channel G (20), and the channel H (21), and finally discharges from the outlet (13).

2. The integrated flow pressure control valve according to claim 1, wherein: When the spring B (11) is not compressed, there is a gap between the bottom surface of the spool B (6) and the top surface of the lower valve body (2), and this gap is the balance chamber A (22); when the spring C (10) is not compressed, there is a gap between the bottom surface of the spool A (5) and the bottom surface of the counterbore of the valve block (1), and this gap is the balance chamber B (23). The balance chamber A (22) and the balance chamber B (23) are communicated through a balance small hole (24) on the spool A (5).

3. An integrated flow pressure control valve according to claim 1, characterized in that: A sealing baffle (25) is arranged at the top end of the spool B (6). The bottom of the feedback rod (7) abuts against the top surface of the sealing baffle (25). The channel E (18) is of an inverted L-shaped structure, and its horizontal channel is located above the sealing baffle (25).

4. An integrated flow pressure control valve according to claim 1, characterized in that: Sealing rings (26) are sleeved on the outer circumferences of the lower valve body (2), the middle valve body (3), the upper valve body (4), and the feedback rod (7).

5. An integrated flow pressure control valve according to claim 1, characterized in that: External threads are provided on the outer circumference of the upper end of the upper valve body (4), and internal threads are provided at the upper end of the counterbore of the valve block (1). The two are fixedly connected together through threads.

6. An integrated flow pressure control valve according to claim 1, characterized in that: The adjusting screw (9) is of a U-shaped structure, and external threads are provided on its outer wall. Internal threads are provided on the inner hole of the upper valve body (4). The two are fixedly connected together through threads.

7. An integrated flow pressure control valve according to claim 1, characterized in that: The feedback rod (7) is of a stepped structure with a large middle and small ends. The inner hole of the middle valve body (3) is a stepped through hole with a small middle and large ends. The lower step surface of the feedback rod (7) is located above the upper step surface of the inner hole of the middle valve body (3), and there is a spacing between the two.

8. An integrated flow pressure control valve according to claim 1, characterized in that: A counterbore structure is formed at the bottom of the upper valve body (4), and a boss structure is formed at the top of the middle valve body (3). The boss structure is snapped into the counterbore structure.

9. An integrated flow pressure control valve according to claim 1, characterized in that: Counterbores are provided at the bottoms of the valve spool A (5) and the valve spool B (6) and on the top surface of the lower valve body (2).

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