A plug-in type cast-in proportional pressure reducing valve

Abstract

The present invention belongs to the technical field of electromagnetic valves, and is specifically a plug-in cast-in proportional pressure reducing valve. It includes an electromagnet assembly, a valve sleeve assembly, a diaphragm assembly, a valve body assembly, a circuit board assembly and a cable connection assembly. One end of the electromagnet assembly is threadedly connected to the valve sleeve assembly, the valve sleeve assembly is threadedly connected to the valve body assembly, and the diaphragm assembly is placed between the electromagnet assembly and the valve body assembly; the other end of the electromagnet assembly is threadedly connected to the circuit board assembly, and the circuit board assembly is threadedly connected to the cable connection assembly. The present invention adopts a tubular cast-in type and a four-stage threaded connection. It is small in size, compact in structure, and easy to assemble, which greatly solves the problem of large volume of the proportional pressure reducing valve.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic valves, in particular to a plug-in type cast-in proportional pressure reducing valve. Background Art

[0002] At present, electro-hydraulic proportional valves are widely used in various mechanical equipment. The pilot control part of the proportional pressure reducing valve is mostly used. The proportional pressure reducing valve plays a vital role in the hydraulic system. In recent years, the integration of various mechanical equipment has become higher and higher. Especially for some special equipment and light and small machinery, the reduction of the main machine volume has gradually become the design focus. On the main machine where every millimeter is important, the demand for miniaturization of proportional pressure reducing valves has become more and more prominent. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a plug-in type cast-in proportional pressure reducing valve.

[0004] The present invention adopts the following technical scheme: a plug-in cast-in proportional pressure reducing valve, comprising an electromagnet assembly, a valve sleeve assembly, a diaphragm assembly, a valve body assembly, a circuit board assembly and a cable connection assembly, wherein one end of the electromagnet assembly is threadedly connected to the valve sleeve assembly, the valve sleeve assembly is threadedly connected to the valve body assembly, and the diaphragm assembly is placed between the electromagnet assembly and the valve body assembly; the other end of the electromagnet assembly is threadedly connected to the circuit board assembly, and the circuit board assembly is threadedly connected to the cable connection assembly.

[0005] Furthermore, the electromagnet assembly includes an iron core, a wire package, a seal I and a seal II; the iron core shell is a barrel-shaped structure, the outer side surfaces of the left and right ends of the iron core are provided with external threads, there is an iron core column at the center of the iron core, a small hole is opened on the end surface of the left end of the iron core, and the end surface of the right end is open, the wire package is pressed in from the right end of the iron core and sealed by the seal I, the wire end of the wire package passes through the small hole at the left end of the iron core, and a seal II is provided on the outside of the iron core to connect with the valve sleeve assembly.

[0006] Furthermore, the valve sleeve assembly includes a valve sleeve, a set screw I and a set screw II; the valve sleeve is threadedly connected to the right side of the core and is locked with the set screw I, and the seal II compressed therebetween can prevent the system oil from leaking out.

[0007] Furthermore, the diaphragm assembly includes a distance sleeve, a leaf spring and an armature, the distance sleeve is sleeved on the armature, a hole I is provided on the armature plane to connect the left and right sides, and a hole II corresponding to the hole I is provided on the leaf spring plane; the leaf spring and the armature are pressed into one body, and a gap is left between the leaf spring and the armature.

[0008] Furthermore, the thickness of the armature minus the thickness of the leaf spring is less than the width of the distance sleeve, and the width difference depends on the suction force of the electromagnet assembly and the proportional coefficient required by the proportional pressure reducing valve. Within the allowable range of the electromagnet suction force, the greater the width difference, the greater the proportional coefficient of the proportional pressure reducing valve.

[0009] Furthermore, the valve body assembly includes a valve body, a filter screen I, a filter screen II, a small valve body and a nozzle; the small valve body is installed from the right end of the valve body and sealed by a seal VI, a nozzle is installed on the small valve body, the nozzle and the small valve body are interference fit, and the outer side of the valve body is equipped with seals III, IV, V and VII; the valve body assembly is provided with a P port, a T port and an A port, the P port leads to the left end face through the inner wall of the valve body, the A port leads to the left end face through the center of the valve body, the T port is connected to the A port and leads to the right end face through the nozzle, and the P port and the A port are respectively provided with a filter screen I and a filter screen II on the outer side. The on-off of the P port and the A port at the left end face is determined by the action of the diaphragm assembly.

[0010] Furthermore, the end surface area of ​​the distance sleeve is smaller than the end surface area of ​​the valve body.

[0011] Furthermore, the circuit board assembly includes a shell, an insulating shell, a circuit board and epoxy resin glue; the circuit board is welded to the wire ends led out of the wire package, the shell is threadedly connected to the iron core, the insulating shell is placed between the shell and the circuit board, and epoxy resin glue is poured after assembly is completed.

[0012] Furthermore, the cable connection assembly includes a cable, a stud screw, a compression sleeve and a locking nut. The cable is welded to the circuit board. The cable passes through the locking nut, the compression sleeve and the stud screw from left to right in sequence. The stud screw is threadedly connected to the shell. The compression sleeve is placed between the stud screw and the locking nut, and the locking nut is threadedly connected to the stud screw.

[0013] Compared with the prior art, the present invention has the following benefits:

[0014] 1. The present invention changes the pull-in time of the electromagnet and the armature by changing the duty cycle, and changes the valve opening time by changing the pull-in time, thereby changing the pressure value of port A, and can effectively realize proportional control.

[0015] 2. Within a certain range, the height difference between the distance sleeve and the armature diaphragm can be adjusted to adjust the opening amount of the valve port when it is opened, so as to adjust the required proportional coefficient, which is convenient, reliable and highly universal.

[0016] 3. The present invention adopts a tubular casting type and a four-section threaded connection, which has a small size, a compact structure, and is easy to assemble, thus greatly solving the problem of the large size of the proportional pressure reducing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the diaphragm assembly;

[0019] Figure 3 It is a schematic diagram of the structure of the valve body assembly;

[0020] Figure 4 It is the hydraulic symbol of the present invention;

[0021] In the figure: 1-electromagnet assembly, 2-valve sleeve assembly, 3-diaphragm assembly, 4-valve body assembly, 5-circuit board assembly, 6-cable connection assembly, 101-iron core, 102-wire package, 103-seal I, 104-seal II, 201-valve sleeve, 202-set screw I, 203-set screw II, 301-distance sleeve, 302-leaf spring, 303-armature, 401-valve body, 40 2-seal III, 403-seal IV, 404-filter I, 405-seal V, 406-filter II, 407-seal VI, 408-seal VII, 409-small valve body, 410-nozzle, 501-housing, 502-insulating housing, 503-circuit board, 504-epoxy resin glue, 601-cable, 602-stud screw, 603-compression sleeve, 604-locking nut. DETAILED DESCRIPTION

[0022] In conjunction with the accompanying drawings, the specific embodiments of the present invention are further described:

[0023] like Figure 1 The plug-in encapsulated proportional pressure reducing valve shown in the figure comprises an electromagnet assembly 1, a valve sleeve assembly 2, a diaphragm assembly 3, a valve body assembly 4, a circuit board assembly 5 and a cable connection assembly 6. One end of the electromagnet assembly 1 is threadedly connected to the valve sleeve assembly 2, the valve sleeve assembly 2 is threadedly connected to the valve body assembly 4, and the diaphragm assembly 2 is placed between the electromagnet assembly 1 and the valve body assembly 4; the other end of the electromagnet assembly 1 is threadedly connected to the circuit board assembly 5, and the circuit board assembly 5 is threadedly connected to the cable connection assembly 6.

[0024] The electromagnet assembly 1 includes an iron core 101, a wire package 102, a seal I 103 and a seal II 104; the outer shell of the iron core 101 is a barrel structure, the outer side surfaces of the left and right ends of the iron core 101 are provided with external threads, there is an iron core column at the center of the iron core 101, a small hole is opened on the end surface of the left end of the iron core 101, and the end surface of the right end is open, the wire package 102 is pressed in from the right end of the iron core 101 and sealed by the seal I 103, the wire end of the wire package 102 passes through the small hole at the left end of the iron core 101, and the outer side of the iron core 101 is provided with a seal II 104 between the valve sleeve assembly 2. After assembly, epoxy resin glue is used to seal the small hole at the left end of the iron core to prevent oil from entering the electromagnet.

[0025] The valve sleeve assembly 1 includes a valve sleeve 201, a set screw I 202 and a set screw II 203; the valve sleeve 201 is threadedly connected to the right side of the core 101 and is locked with the set screw I 202, and the seal II pressed therebetween can prevent the system oil from leaking out.

[0026] like Figure 2The diaphragm assembly 3 shown includes a distance sleeve 301, a leaf spring 302 and an armature 303. The distance sleeve 301 is sleeved on the armature 303. The armature 303 has a hole I on its plane for connecting the left and right sides. The leaf spring 302 has a hole II corresponding to the hole I. The leaf spring 302 and the armature 303 are pressed together into one body. A gap is left between the leaf spring 302 and the armature 303 to provide space for the leaf spring to move. The armature is made of a soft magnetic material with low coercive force. The material used for the leaf spring has a high elastic deformation capacity, and the oil can flow well at both ends of the diaphragm assembly. The thickness of the armature 303 minus the thickness of the leaf spring 302 is less than the width of the distance sleeve 301.

[0027] Figure 3 As shown, the valve body assembly 4 includes a valve body 401, a filter screen I 404, a filter screen II 406, a small valve body 409 and a nozzle 410; the small valve body 409 is installed from the right end of the valve body 401 and is sealed by a seal VI 407, the small valve body 409 is provided with a nozzle 410, the nozzle 410 and the small valve body 409 are interference fit, the outer side of the valve body 401 is provided with a seal III 402, a seal IV 403, a seal V 405 and a seal VII 408; the valve body assembly 4 is provided with a P port, a T port and an A port, the P port leads to the left end face through the inner wall of the valve body 401, the A port leads to the left end face through the center of the valve body 401, the T port is connected to the A port and leads to the right end face through the nozzle, and the outer sides of the P port and the A port are provided with a filter screen I 404 and a filter screen II 406 respectively. The nozzle is made of hard alloy; seal III is installed in the valve body, the valve body is installed and pressed from the right end of the valve sleeve, and locked with set screw II, and seal III is used to prevent oil leakage; seal IV, seal V, and seal VI are installed in the valve body to seal the present invention and the insertion hole to prevent oil leakage.

[0028] There are an oil inlet P, a control port A and an oil unloading port T on the side of the valve body 401. A filter I404 is installed at the oil inlet P, and a filter II406 is installed at the control port A. Filters I404 and II406 are used to clean the oil to prevent control failure caused by blockage at the contact between the armature and the valve body. When the electromagnet is energized and supplied with fluid from the P port, due to the large flow rate, the leakage of the pressure at the T port on the A port has little effect and will not cause the problem of pressure loss. When the pilot valve at the other end of the main valve is working, a small amount of oil will enter the A port due to the movement of the main valve spool. At this time, the oil can directly return to the oil tank from the T port, reducing the back pressure effect when the main valve spool moves. Its hydraulic symbol is as follows Figure 4 shown.

[0029] The circuit board assembly 5 includes a shell 501, an insulating shell 502, a circuit board 503 and epoxy resin glue 504; the circuit board 503 is welded to the wire ends led out of the wire package, the shell 501 is threadedly connected to the iron core, and the insulating shell 502 is placed between the shell 501 and the circuit board to prevent the circuit board and the shell 501 from contacting and short-circuiting. After assembly is completed, epoxy resin glue 504 is poured in to prevent the shell 501 from loosening during use.

[0030] The cable connection assembly 6 includes a cable 601, a stud screw 602, a compression sleeve 603 and a locking nut 604. The cable 601 is welded to the circuit board. The stud screw 602 passes through the cable 601 and is threadedly connected to the housing 501. The compression sleeve 603 passes through the cable and is placed on the right end of the stud screw 602. The locking nut 604 passes through the cable 601 and is threadedly connected to the stud screw 602. Tightening the locking nut 604 can compress the compression sleeve 603 and the cable 601 to prevent the cable 601 from being pulled out of the valve.

[0031] The working process is as follows:

[0032] The cable inputs PWM electrical signals, and the internal armature vibrates at a high frequency. When the potential is high, the armature is attracted by the iron core, and the valve port is opened; when the potential is low, the iron core and the armature are released, and the valve port is closed. When the valve port is open, the hydraulic oil medium enters from the P port of the valve body, and enters the A port from the contact point between the valve body and the armature, providing pressure to the main valve. By changing the duty cycle of the PWM signal, the ratio of the valve port opening time to the closing time can be changed accordingly, thereby achieving the purpose of changing the pressure ratio of the A port.

[0033] When the electromagnet is powered off, the core suction force disappears, and the elastic force of the leaf spring causes the armature to return to its original position and close to the valve body; the end surface area B of the distance sleeve is smaller than the end surface area C of the valve body. Due to the difference in area between the two ends of the leaf spring, pressure will act on the left end of the leaf spring, causing the armature to press the valve port again;

[0034] When the pilot valve at the other end of the main valve is working, a small amount of oil will enter port A due to the movement of the main valve spool. At this time, the oil can return to the oil tank directly from port T.

Claims

1. A plug-in type cast-in proportional pressure reducing valve, characterized in that: The invention comprises an electromagnet assembly (1), a valve sleeve assembly (2), a diaphragm assembly (3), a valve body assembly (4), a circuit board assembly (5) and a cable connection assembly (6); one end of the electromagnet assembly (1) is threadedly connected to the valve sleeve assembly (2); the valve sleeve assembly (2) is threadedly connected to the valve body assembly (4); the diaphragm assembly (3) is disposed between the electromagnet assembly (1) and the valve body assembly (4); the other end of the electromagnet assembly (1) is threadedly connected to the circuit board assembly (5); and the circuit board assembly (5) is threadedly connected to the cable connection assembly (6); The electromagnet assembly (1) comprises an iron core (101), a wire package (102), a seal I (103) and a seal II (104); the outer shell of the iron core (101) is a barrel-shaped structure, the outer side surfaces of the left and right ends of the iron core (101) are provided with external threads, an iron core column is provided at the center of the iron core (101), a small hole is provided on the end surface of the left end of the iron core (101), and the end surface of the right end is open, the wire package (102) is pressed into the right end of the iron core (101) and sealed by the seal I (103), the wire end of the wire package (102) passes through the small hole at the left end of the iron core (101), and a seal II (104) is provided on the outside of the iron core (101) to connect with the valve sleeve assembly (2); The diaphragm assembly (3) comprises a distance sleeve (301), a leaf spring (302) and an armature (303); the distance sleeve (301) is sleeved on the armature (303); a hole I is provided on the plane of the armature (303) to allow the left and right sides to communicate with each other; a hole II corresponding to the hole I is provided on the plane of the leaf spring (302); the leaf spring (302) and the armature (303) are pressed together into one body, and a gap is left between the leaf spring (302) and the armature (303); The valve body assembly (4) comprises a valve body (401), a filter screen I (404), a filter screen II (406), a small valve body (409) and a nozzle (410); the small valve body (409) is installed from the right end of the valve body (401) and is sealed by a seal VI (407); the small valve body (409) is provided with a nozzle (410), the nozzle (410) and the small valve body (409) are interference fit; the valve body (401) is provided with a seal on the outside. Seal III (402), seal IV (403), seal V (405) and seal VII (408); the valve body assembly (4) is provided with a P port, a T port and an A port, the P port leads to the left end surface through the inner wall surface of the valve body (401), the A port leads to the left end surface through the center of the valve body (401), the T port is connected to the A port and leads to the right end surface through the nozzle, and the P port and the A port are respectively provided with a filter screen I (404) and a filter screen II (406) on the outside; The circuit board assembly (5) comprises a housing (501), an insulating housing (502), a circuit board (503) and epoxy resin glue (504); the circuit board (503) is welded to the wire ends led out of the wire package (102), the housing (501) is threadedly connected to the iron core (101), the insulating housing (502) is placed between the housing (501) and the circuit board (503), and epoxy resin glue (504) is poured after assembly is completed; The cable connection assembly (6) comprises a cable (601), a stud screw (602), a compression sleeve (603) and a locking nut (604); the cable (601) is welded to the circuit board (503); the cable (601) passes through the locking nut (604), the compression sleeve (603) and the stud screw (602) in sequence from left to right; the stud screw (602) is threadedly connected to the housing (501); the compression sleeve (603) is disposed between the stud screw (602) and the locking nut (604); and the locking nut (604) is threadedly connected to the stud screw (602).

2. The plug-in type cast-in proportional pressure reducing valve according to claim 1, characterized in that: The thickness of the armature (303) minus the thickness of the leaf spring (302) is less than the width of the distance sleeve (301).

3. The plug-in type cast-in proportional pressure reducing valve according to claim 1, characterized in that: The end surface area of ​​the distance sleeve (301) is smaller than the end surface area of ​​the valve body (401).

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