Two-stage pressure control valve

Abstract

To provide a two-stage pressure control valve which can output different pressure by one valve body without adding a device.SOLUTION: A constitution of a two-stage pressure control valve of the present invention comprises a valve body, a valve disc, a retainer body, a solenoid, a movable iron core, a compression spring, a high-pressure side stopper for regulating a position of the movable iron core at an output of high pressure, and a low-pressure side stopper for regulating the position of the moving body iron core at an output of low pressure. The high-pressure side stopper has a high-pressure side block arranged at the valve body side of the movable iron core, and functioning as a fixed iron core, and a sleeve joined to the high-pressure-side block, inserted with the moving body iron core, and positioning the high-pressure side block. The low-pressure side stopper has a low-pressure side block arranged at a side opposite to the high-pressure side block with respect to the movable iron core, and a screw joined to the low-pressure side block, inserted into the sleeve, and positioning the low-pressure side block.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a two-stage pressure control valve that outputs fluids at different pressures. [Background technology]

[0002] In a hydraulic circuit that supplies hydraulic pressure to a hydraulic drive device, a two-stage pressure control valve that outputs fluids of different pressures (two pressures) may be used. Examples of two-stage pressure control valves include a two-pressure reducing valve, a two-stage relief valve, and a two-pressure pressure control valve. For example, Patent Document 1 discloses a two-stage proportional pressure reducing valve that includes "a solenoid valve, a valve body oriented in the axial direction of the solenoid valve and integrally attached to the solenoid valve, a sleeve slidably inserted into the valve body and having a drain port, first and second discharge ports, and an input port formed in the axial direction perpendicular to the axial direction at intervals, a proportional pressure reducing valve section attached to the valve body and adjusting a set pressure, and a pressure reducing valve section attached to the valve body and reducing the pressure to a maximum operating pressure or lower."

[0003] In the two-stage proportional pressure reducing valve of Patent Document 1, the proportional pressure reducing valve portion includes "a first spool that is slidably inserted into the sleeve and arranged coaxially on the bush pin of the solenoid valve, and that forms a large diameter portion having a cross-sectional area that engages with the drain port and a small diameter portion having a cross-sectional area smaller than the cross-sectional area of ​​the large diameter portion that engages with a first communicating passage formed between the first and second discharge ports, a first spring member that is provided on an end face of the first spool and returns the first spool to an initial position when the solenoid valve is de-energized, an oil passage that is drilled approximately in the axial center of the spool and discharges oil in the sleeve to the drain port, and an introduction portion that is formed on an end face of a shaft portion formed between the large diameter portion and the small diameter portion and that communicates with the first communicating passage."

[0004] In the two-stage proportional pressure reducing valve of Patent Document 1, the pressure reducing valve portion includes "a large diameter portion provided coaxially with the spool, slidably inserted into the sleeve and engaged with the input port, a stepped piston formed by a small diameter portion smaller than the large diameter portion and engaging with a first communication passage provided between the input port and the first discharge port, and a second spring member attached between the stepped piston and a spring bearing inserted into the end of the spool." Also, "a first oil passage communicating with the bush pin is formed approximately at the axial center of the first spool and the spring bearing, and a second oil passage connecting the stepped piston to the input port and the second communication passage is formed." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-142696 A Summary of the Invention [Problem to be solved by the invention]

[0006] According to Patent Document 1, it is possible to perform the two-stage pressure reduction from high pressure to low pressure, which was previously performed using two pressure reducing valves, with a single pressure reducing valve. However, the configuration of Patent Document 1 requires the provision of a new proportional pressure reducing valve section (electromagnetic proportional valve), and also requires a driving amplifier that controls the current of the proportional pressure reducing valve section. This leads to increased costs and larger equipment, so there is room for further improvement in the technology of Patent Document 1.

[0007] In view of the above problems, an object of the present invention is to provide a two-stage pressure control valve that is capable of outputting fluids of different pressures from a single valve body without requiring any additional device. [Means for solving the problem]

[0008] In order to solve the above problems, a representative configuration of a two-stage pressure control valve according to the present invention includes a valve body provided with an input port and an output port, a valve element housed in the valve body, a retainer body adjacent to the valve body, a solenoid housed in the retainer body, a movable core housed in the solenoid, a compression spring arranged between the valve element and the movable core, a high-pressure side stopper that regulates the position of the movable core when high pressure is output, and a low-pressure side stopper that regulates the position of the movable core when low pressure is output, wherein the high-pressure side stopper has a high-pressure side block that is arranged on the valve element side of the movable core and functions as a fixed core, and a sleeve that is joined to the high-pressure side block, into which the movable core is inserted, and that positions the high-pressure side block, and the low-pressure side stopper has a low-pressure side block that is arranged on the opposite side of the movable core to the high-pressure side block, and a screw that is joined to the low-pressure side block, inserted into the sleeve, and that positions the low-pressure side block.

[0009] The sleeve may be threadedly engaged with the retainer body, and the screw may be threadedly engaged with the sleeve. Effect of the Invention

[0010] According to the present invention, it is possible to provide a two-stage pressure control valve capable of outputting fluids at different pressures from one valve element without requiring any additional device. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram illustrating a two-pressure reducing valve as a two-stage pressure control valve according to the present embodiment. [Diagram 2] 13A and 13B are diagrams for explaining the positioning of a high pressure side stopper. [Diagram 3] 11A and 11B are diagrams for explaining the positioning of a low-pressure side stopper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific values ​​shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present invention are not shown.

[0013] 1 is a diagram for explaining a two-pressure reducing valve 100 as a two-stage pressure control valve according to this embodiment. Note that in this embodiment, the two-pressure reducing valve 100 is exemplified as a two-stage pressure control valve, but the present invention is not limited thereto, and the present invention can also be applied to a two-stage relief valve.

[0014] 1, the dual pressure reducing valve 100 of this embodiment includes a valve body 110 and a retainer body 120 disposed adjacent thereto. The valve body 110 is formed with an input port 112 and an output port 114. A fluid such as hydraulic oil supplied to the valve body 110 through the input port 112 is reduced in pressure in the dual pressure reducing valve 100 and is sent to a hydraulic circuit (not shown) through the output port 114. The valve body 110 also accommodates a valve element 130 (poppet valve).

[0015] The retainer body 120 houses a solenoid 140, and is fitted with a power plug 102 that supplies current to the solenoid 140. Inside the solenoid 140, a movable iron core 150 (also called a plunger) made of a magnetic material is housed.

[0016] The movable core 150 has a movable block 152 and a shaft portion 154 having a smaller diameter than the movable block 152. A compression spring 160 is disposed between the shaft portion 154 of the movable core 150 and the valve body 130. The compression spring 160 biases the shaft portion 154 of the movable core 150 and the valve body 130 in a direction separating them.

[0017] As shown in FIG. 1, the dual pressure reducing valve 100 according to this embodiment is characterized by having a high pressure side stopper 170 and a low pressure side stopper 180.

[0018] High-pressure side stopper 170 regulates the position of movable iron core 150 when high pressure is output. As shown in Fig. 1, high-pressure side stopper 170 is disposed between solenoid 140 and movable iron core 150 inside retainer body 120. Hereinafter, the space inside retainer body 120 in which high-pressure side stopper 170 can move is referred to as a first piston chamber 192.

[0019] The high-pressure side stopper 170 includes a high-pressure side block 172 and a sleeve 174 joined thereto. The high-pressure side block 172 is made of a magnetic material, is disposed on the valve body 130 side of the movable iron core 150, and functions as a fixed iron core. The sleeve 174 is made of a non-magnetic material, has the movable iron core 150 inserted therein, and positions the high-pressure side block 172.

[0020] Particularly in this embodiment, sleeve 174 has a screw groove 174a formed on its outer circumferential surface and is screwed into retainer body 120. A fixing nut 176 is attached to the side of sleeve 174 that is exposed from retainer body 120. Also, a two-sided cut 174b is formed on the end of sleeve 174 that is exposed from retainer body 120 so that it can be clamped with a tool (not shown) such as a wrench.

[0021] 2A and 2B are diagrams for explaining the positioning of the high-pressure side stopper 170. In Fig. 2A and 2B, the solenoid 140 is in an energized state, and the movable block 152 is attracted to the high-pressure side block 172.

[0022] When the two-sided cut 174b is clamped with a tool and the sleeve 174 is rotated in the A direction (twisted to the right), the high pressure side stopper 170 moves in the D1 direction toward the valve body 130. When the high pressure side stopper 170 has completely moved in the D1 direction in the first piston chamber 192 as shown in Fig. 2(a), the tip of the movable block 152 (the end on the valve body 130 side) when energized is positioned at P1.

[0023] When the two-sided cut 174b is clamped with a tool and the sleeve 174 is rotated in the B direction (twisted to the left), the high pressure side stopper 170 moves in the D2 direction away from the valve body 130. When the high pressure side stopper 170 has completely moved in the D2 direction in the first piston chamber 192 as shown in FIG. 2(b), the tip of the movable block 152 is positioned at P2 when energized.

[0024] Therefore, the movable range of the movable block 152 (more precisely, the movable core 150) on the high pressure side is from P1 to P2, and by moving the movable block 152 within this range, the pressure on the high pressure side, i.e., the pressure during high pressure output, can be adjusted.

[0025] Low-pressure side stopper 180 regulates the position of movable core 150 during low voltage output. As shown in Fig. 1, low-pressure side stopper 180 is housed inside high-pressure side stopper 170. Hereinafter, the space inside high-pressure side stopper 170 in which low-pressure side stopper 180 can move is referred to as a second piston chamber 194.

[0026] Low-pressure-side stopper 180 includes low-pressure-side block 182 and a screw 184 joined thereto. Low-pressure-side block 182 is made of a non-magnetic material, and is disposed inside sleeve 174 on the opposite side of high-pressure-side block 172 with respect to movable iron core 150. Screw 184 is inserted through sleeve 174 to position low-pressure-side block 182.

[0027] Particularly in this embodiment, the screw 184 is screwed into the sleeve 174. A fixing nut 186 is attached to the side of the screw 184 that is exposed from the sleeve 174. Also, a hole 184a is formed in the end of the screw 184 that is exposed from the sleeve 174, into which a tool (not shown) such as a hexagonal wrench is inserted.

[0028] 3A and 3B are diagrams for explaining the positioning of the low-pressure side stopper 180. Figures 3A and 3B illustrate a state in which the solenoid 140 is in a non-energized state and the movable block 152 is biased by the compression spring 160.

[0029] When a tool is inserted into the hole 184a and the screw 184 is rotated in the C direction (twisted to the right), the low-pressure-side stopper 180 moves in the D3 direction toward the valve body 130. When the low-pressure-side stopper 180 has completely moved in the D3 direction in the second piston chamber 194 as shown in Fig. 3(a), the rear end of the movable block 152 (the end opposite the valve body 130) when de-energized is positioned at P3.

[0030] When a tool is inserted into the hole 184a and the screw 184 is rotated in the D4 direction (twisted to the left), the low-pressure-side stopper 180 moves in the D4 direction away from the valve body 130. When the low-pressure-side stopper 180 has completely moved in the D4 direction in the second piston chamber 194 as shown in Fig. 3(b), the rear end of the movable block 152 when not energized is positioned at P4.

[0031] Therefore, the movable range of the movable block 152 (more precisely, the movable core 150) on the low pressure side is from P3 to P4, and by moving the movable block 152 within this range, the pressure on the low pressure side, i.e., the pressure during low pressure output, can be adjusted.

[0032] As described above, in the dual pressure reducing valve 100 of this embodiment, the high pressure side movable range of the movable core 150 can be restricted by the high pressure side stopper 170, and the low pressure side movable range of the movable core 150 can be restricted by the low pressure side stopper 180. By energizing the solenoid 140, the movable core 150 is attracted to the high pressure side block 172 and supplies high pressure fluid. By deenergizing the solenoid 140, the movable core 150 is pushed by the compression spring 160 and returns to the right in the figure, supplying low pressure fluid. Therefore, it is possible to output fluids of different pressures from one valve body 130.

[0033] In other words, the present invention enables adjustment of the range of movement of the movable iron core 150 on the high pressure side and low pressure side by using the coaxial high pressure side stopper 170 and low pressure side stopper 180, thereby adjusting the amount of compression of the compression spring 160 at high pressure and low pressure, thereby adjusting the two pressures.

[0034] In the above configuration, the only additional parts are the high pressure side stopper 170 and the low pressure side stopper 180, which are housed in the retainer body 120. Therefore, there is no need to add a new device such as an amplifier for the electromagnetic proportional valve, and it is possible to obtain the above-mentioned effects without increasing the cost or size of the device.

[0035] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that such examples also naturally belong to the technical scope of the present invention. [Industrial Applicability]

[0036] The present invention can be utilized as a two-stage pressure control valve that outputs fluids at different pressures. [Explanation of symbols]

[0037] 100...two-pressure reducing valve, 102...power plug, 110...valve body, 112...input port, 114...output port, 120...retainer body, 130...valve body, 140...solenoid, 150...movable core, 152...movable block, 154...shaft portion, 160...compression spring, 170...high pressure side stopper, 172...high pressure side block, 174...sleeve, 174a...thread groove, 174b...two-sided cut, 176...nut, 180...low pressure side stopper, 182...low pressure side block, 184...screw, 184a...hole, 186...nut, 192...first piston chamber, 194...second piston chamber

Claims

1. a valve body having an input port and an output port; A valve element accommodated in the valve body; a retainer body adjacent to the valve body; A solenoid housed in the retainer body; a movable core accommodated in the solenoid; a compression spring disposed between the valve body and the movable core; a high-voltage side stopper that regulates the position of the movable core when a high voltage is output; a low-voltage side stopper that regulates the position of the movable core when a low voltage is output; Equipped with The high pressure side stopper is a high-pressure side block that is disposed on the valve body side of the movable iron core and functions as a fixed iron core; a sleeve joined to the high-pressure side block, into which the movable core is inserted, and which positions the high-pressure side block; having The low pressure side stopper is a low-voltage side block disposed on the opposite side of the high-voltage side block with respect to the movable iron core; a screw that is joined to the low-pressure side block, that is inserted into the sleeve, and that positions the low-pressure side block; A two-stage pressure control valve comprising:

2. 2. The two-stage pressure control valve according to claim 1, wherein said sleeve is threadedly engaged with said retainer body, and said screw is threadedly engaged with said sleeve.

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