CN111594506B - Electromagnetic proportional valve - Google Patents
Electromagnetic proportional valve Download PDFInfo
- Publication number
- CN111594506B CN111594506B CN202010067482.8A CN202010067482A CN111594506B CN 111594506 B CN111594506 B CN 111594506B CN 202010067482 A CN202010067482 A CN 202010067482A CN 111594506 B CN111594506 B CN 111594506B
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- China
- Prior art keywords
- pressure
- spool
- solenoid
- chamber
- electromagnetic proportional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000010276 construction Methods 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 8
- 230000007935 neutral effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000000470 constituent Substances 0.000 description 5
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0435—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being sliding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/42—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor
- F16K31/423—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor the actuated members consisting of multiple way valves
- F16K31/426—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor the actuated members consisting of multiple way valves the actuated valves being cylindrical sliding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0603—Multiple-way valves
- F16K31/061—Sliding valves
- F16K31/0613—Sliding valves with cylindrical slides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The invention provides an electromagnetic proportional valve. An electromagnetic proportional valve according to an embodiment of the present invention includes: a pressure receiving chamber maintained as a control pressure supplied to a control object, and a pressure sensor for detecting the control pressure in the pressure receiving chamber.
Description
Technical Field
The present disclosure relates generally to an electromagnetic proportional valve.
Background
An electromagnetic proportional valve is known that adjusts supply and discharge of pilot oil to and from a hydraulic device to be controlled in accordance with an excitation current. The conventional electromagnetic proportional valve includes: a valve body for accommodating a spool movable in an axial direction and a driving device for driving the spool. In this electromagnetic proportional valve, by switching the position of the spool in the axial direction, the control pressure corresponding to the position of the spool can be supplied to the hydraulic device to be controlled.
As disclosed in japanese patent application laid-open No. 2005-188707 (patent document 1), an electromagnetic proportional valve is used as a pilot valve in a reversing valve. In the reversing valve described in this publication, the spool position of the main spool is switched by the control pressure supplied from the electromagnetic proportional valve.
In order to calibrate the control pressure output from the electromagnetic proportional valve, the control pressure needs to be monitored. Conventionally, as described in japanese patent application laid-open No. 2001-289202 (patent document 2), a pressure measurement port for obtaining a control pressure output from an electromagnetic proportional valve is provided in a connection module between the electromagnetic proportional valve and a valve structure to be controlled, and a pressure sensor for measuring the control pressure is attached to the pressure measurement port to detect the control pressure.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2005-188707
Patent document 2: japanese patent laid-open No. 2001-289202
Disclosure of Invention
Problems to be solved by the invention
In order to detect the control pressure output from the conventional electromagnetic proportional valve, it is necessary to provide a pressure measuring port in the connection module and a joint for attaching the pressure sensor to the connection module.
One of the purposes of the present disclosure is to simplify the mechanism for detecting the control pressure of an electromagnetic proportional valve. One of the objects of the present disclosure is to detect the control pressure of an electromagnetic proportional valve without providing a pressure measuring port or a joint outside the electromagnetic proportional valve. Other objects than the above objects of the present disclosure will be apparent from the entire description of the present specification.
Solution for solving the problem
The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a spool movable in an axial direction and a control port portion disposed on one side of the spool in the axial direction and configured to supply a control pressure to a control target; and a driving device having: a solenoid coil disposed on the other side of the spool in the axial direction, the solenoid coil varying the control pressure by an exciting current; and a pressure receiving chamber which accommodates the solenoid coil and is connected to the control port portion.
The electromagnetic proportional valve according to an aspect of the present invention includes a pressure sensor for detecting the control pressure in the pressure receiving chamber.
The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a valve body, a control port portion disposed on one side in an axial direction of the valve body, and a spool movably housed in the valve body and changing a control pressure of the control port portion by using the axial position; and a driving device having: a solenoid coil disposed on a side opposite to the control port portion with respect to the valve unit, the solenoid coil changing the axial position of the spool by an exciting current; a housing for receiving the solenoid coil; and a pressure receiving chamber which is located in the housing and is connected to the control port portion.
In one aspect of the invention, the housing includes a pressure sensor for detecting the control pressure in the pressure-receiving chamber.
The electromagnetic proportional valve according to an aspect of the present invention includes a cover portion that covers the pressure sensor and is mounted on the housing.
In one embodiment of the invention, the drive device comprises a drive rod which delimits at least a part of the pressure chamber.
In one aspect of the present invention, the driving device includes a plunger that defines at least a part of the pressure chamber and is provided to the driving rod.
The electromagnetic proportional valve according to one aspect of the present invention includes: a valve unit having a valve body, a control port portion disposed on one side in an axial direction of the valve body, and a spool movably housed in the valve body and changing a control pressure of the control port portion by using the axial position; a driving device, which has: a solenoid coil disposed on a side opposite to the control port portion with respect to the valve unit, the solenoid coil changing the axial position of the spool by an exciting current; a housing for receiving the solenoid coil; and a pressure receiving chamber located in the housing and connected to the control port section; a pressure sensor for detecting the control pressure in the pressure-receiving chamber; and a cover part which covers the pressure sensor and is mounted on the housing.
The reversing valve according to one embodiment of the present invention includes any one of the electromagnetic proportional valves described above.
The construction machine according to an aspect of the present invention includes the above-described reversing valve.
ADVANTAGEOUS EFFECTS OF INVENTION
By adopting the technical scheme of the invention, the control pressure output by the electromagnetic proportional valve can be detected without arranging a pressure measuring port and a connector outside the electromagnetic proportional valve.
Drawings
Fig. 1 is a view schematically showing the external appearance of an electromagnetic proportional valve according to an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the electromagnetic proportional valve of fig. 1. In fig. 2, the spool is in the neutral position.
Fig. 3 is a longitudinal sectional view of the electromagnetic proportional valve of fig. 1. In fig. 3, the spool is in the feed position.
Fig. 4 is a longitudinal sectional view of the electromagnetic proportional valve of fig. 1. In fig. 4, the spool is in the exhaust position.
Fig. 5 is a block diagram illustrating a reversing valve including the electromagnetic proportional valve of fig. 1.
Fig. 6 is a block diagram illustrating a construction machine including the reversing valve of fig. 5.
Description of the reference numerals
1. An electromagnetic proportional valve; 10. a driving device; 11. a housing; 12. a cover portion; 14a, 1 st solenoid chamber; 14b, 2 nd solenoid chamber; 15. a pressure sensor; 23. a solenoid coil; 24. fixing an iron core; 26. a plunger; 27. a driving rod; 30. a valve unit; 40. a valve body; 70. a spool; p, a pressure source; t, tank; ap, control port part; pp, pressure source port portion; tp, can port; mp, main flow path; cp1, 1 st connecting channel; cp2, the 2 nd connecting flow path; cp3, 3 rd connecting channel.
Detailed Description
Hereinafter, various embodiments of the present invention will be described with reference to the drawings as appropriate. In the drawings, the same reference numerals are assigned to components common to the drawings. It should be noted that for ease of illustration, the drawings are not necessarily illustrated to exact scale. In each drawing, some constituent elements may be omitted for convenience of description.
An electromagnetic proportional valve 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 4. Fig. 1 is a view schematically showing an external appearance of an electromagnetic proportional valve 1 according to an embodiment of the present invention, and fig. 2 to 4 are longitudinal sectional views of the electromagnetic proportional valve 1.
As shown in the figure, the electromagnetic proportional valve 1 includes a driving device 10 and a valve unit 30. The drive device 10 and the valve unit 30 are arranged along the central axis a. In this specification, the direction along the central axis a is sometimes simply referred to as the "axial direction". In the present specification, the front and rear directions in the axial direction are referred to with reference to the front and rear directions shown in fig. 1 to 4 unless otherwise described. Following this usage, the valve unit 30 is arranged in front of the driving device 10.
The valve unit 30 includes a hollow valve body 40 extending in the axial direction and a spool 70 provided in the valve body 40 so as to be movable in the axial direction.
The driving device 10 drives the spool 70 to control the axial position of the spool 70. The driving device 10 includes: the hollow housing 11, the cover 12, the pressure sensor 15, the solenoid coil 23, the fixed iron core 24, the plunger 26, and the drive rod 27 provided to the plunger 26.
The housing 11 has a cylindrical shape extending in the direction of the central axis a. The housing 11 has an outer wall 11a and a guide wall 11b that divide an inner space thereof from an outer space. The outer wall 11a has a cylindrical shape. The guide wall 11b has a cylindrical shape coaxial with the outer wall 11a and having a diameter smaller than that of the outer wall 11 a. The guide wall 11b is provided at a position radially distant from the outer wall 11 a. Thereby, a space is defined between the outer wall 11a and the guide wall 11b. A solenoid coil 23 is supported in a space between the outer wall 11a and the guide wall 11b.
The housing 11 has a through hole extending in the axial direction. In other words, the housing 11 is hollow, and the inner space thereof is opened in front and rear of the housing 11. The opening in the front of the housing 11 is sealed by the fixed iron core 24. The opening at the rear of the housing 11 is sealed by a cover 12. The cover 12 seals the opening at the rear of the housing 11, thereby maintaining the pressure-receiving chamber at a control pressure. The cover 12 is a cover, a cover body, a seal, and other members than those described above for closing the opening in the rear of the housing 11 and maintaining the pressure receiving chamber at a controlled pressure. The cover 12 may be integral with the housing 11. In other words, the cover 12 and the housing 11 may have a unitary, one-piece structure. In order to seal the opening of the housing 11, a sealing member is used as necessary in addition to the fixed iron core 24 and the cover 12. The shape and arrangement of the cover 12 are not limited to those explicitly described in the present specification. The cover 12 may also cooperate with further members to seal the opening in the rear of the housing 11.
The plunger 26 and the drive rod 27 are disposed on the central axis a in a cylindrical space defined by the guide wall 11 b. The plunger 26 and the drive rod 27 are both provided so as to be movable in the forward and backward directions along the central axis a. The plunger 26 and the drive rod 27 may also have a one-piece, unitary construction. The drive rod 27 extends axially forward from the plunger 26. In the illustrated embodiment, the drive rod 27 slightly protrudes axially rearward from the plunger 26. The drive lever 27 is a rod-like member extending along the central axis a.
At least a part of the plunger 26 is formed of a magnetic material. At least a part of the plunger 26 is disposed radially inward of the solenoid coil 23. The plunger 26 has a through hole 26a extending in the axial direction at a position offset radially outward from the central axis a.
The inner space of the housing 11 is divided by the plunger 26. Specifically, the internal space of the housing 11 is divided into a1 st solenoid chamber 14a on the rear side of the plunger 26 in the axial direction and a2 nd solenoid chamber 14b on the front side of the plunger 26 in the axial direction. The 1 st solenoid chamber 14a and the 2 nd solenoid chamber 14b are connected by a through hole 26 a. Thus, the through hole 26a connects the 1 st solenoid chamber 14a and the 2 nd solenoid chamber 14b. In the present specification, the flow path of the hydraulic oil defined by the through-hole 26a may be referred to as a1 st connecting flow path cp1.
The pressure sensor 15 is a sensor that detects the pressure of the 1 st solenoid chamber 14a. The pressure sensor 15 transmits a detection signal indicating the detected pressure to a controller not shown. In one embodiment, the pressure sensor 15 is disposed such that at least a portion thereof is exposed to the 1 st solenoid chamber 14a. In the illustrated embodiment, the pressure sensor 15 may have a part of its lower surface 15a exposed to the 1 st solenoid chamber 14a, or may have the entire lower surface 15a exposed to the 1 st solenoid chamber 14a. The lower surface 15a of the pressure sensor 15 may have a stainless steel diaphragm, a silicon diaphragm, or a diaphragm other than them. The pressure sensor 15 may include a strain gauge that converts a change in resistance due to deformation of the diaphragm into an electrical signal. The pressure sensor applicable to the present invention is not limited to the pressure sensor explicitly described in the present specification.
In the illustrated embodiment, the pressure sensor 15 is provided in the cover 12. At least a part of the pressure sensor 15 is covered with the cover 12. The installation location of the pressure sensor 15 is not limited to the illustrated location. The pressure sensor 15 may be provided at other positions of the cover 12. The pressure sensor 15 may be provided in a component of the electromagnetic proportional valve 1 other than the cover 12. The pressure sensor 15 may be provided in the housing. For example, the pressure sensor 15 may be attached to the inner peripheral surface of the housing 11.
The solenoid coil 23 is excited based on a control signal input from a controller not shown. The controller includes: a processor for performing various arithmetic processing, a memory for storing various programs and various data, and a device interface. The device interface is connected to the solenoid coil 23, the pressure sensor 15, and devices other than them. The controller outputs a control signal (control pulse) to the solenoid coil 23 to drive the plunger 26 and the drive rod 27, thereby switching the position of the spool 70. The controller determines a control pressure to be output to a control port portion ap described later based on a detection signal from the pressure sensor 15.
The fixed core 24 has a substantially cylindrical shape. The fixed core 24 has a through hole extending in the axial direction at the radial center thereof. A drive rod 27 is inserted into the through hole. The driving rod 27 can enter the inner space of the valve unit 30 from the fixed iron core 24. The tip (front end) of the drive rod 27 is in contact with the base end (rear end) of the spool 70.
The fixed core 24 has a through hole 24a extending in the axial direction at a position offset radially outward from the central axis a. The through hole 24a is provided at a position facing the through hole 26 a. The 2 nd solenoid chamber 14b is connected to a preliminary chamber 41 described later by a through hole 24a. The 2 nd solenoid chamber 14b and the preliminary chamber 41 are connected by the through hole 24a. In the present specification, the flow path defined by the through-hole 24a may be referred to as a2 nd connection flow path cp2.
Plunger 26 is driven by solenoid coil 23. That is, the plunger 26 is driven by the solenoid coil 23 so as to be movable in the axial direction. Specifically, when an exciting current is applied to the solenoid coil 23, the plunger 26 is attracted to the fixed core 24, and the plunger 26 and the drive rod 27 move axially forward. When the drive rod 27 moves axially forward, the spool 70 is pushed axially forward by the drive rod 27. In this way, the spool 70 is driven by the driving section having the solenoid coil 23, the fixed core 24, the plunger 26, and the driving rod 27.
Next, the valve unit 30 will be described. As described above, the valve unit 30 includes: a valve body 40 and a spool 70 movably provided to the valve body 40. The valve body 40 has a through hole 40a extending in the axial direction. The through hole 40a extends from the front end to the rear end of the valve body 40 in the axial direction. The valve body 40 has a recess 40b in the radial center of the rear end thereof. The preliminary chamber 41 is defined by the upper surface of the defining recess 40b of the valve body 40, the front surface of the fixed core 24, the driving rod 27, and the spool 70.
The valve main body 40 has a pressure source port portion pp connected to the pressure source P, a tank port portion tp connected to the tank T, and a control port portion ap for outputting a control pressure. The control port portion ap is disposed on one axial side (front side) of the spool 70 or the valve body 40. A solenoid coil 23 is provided on the other axial side (rear side) of the spool 70. The control port portion ap is formed by a region near the front end of the through hole 40 a. The control port ap is connected to a hydraulic device to be controlled via a flow path not shown. Thereby, the control port portion ap is used to supply the control pressure to the hydraulic device to be controlled.
The spool 70 has a shaft shape extending in the axial direction. The spool 70 is provided in the through hole 40a so as to be movable in the axial direction. The rear end of the spool 70 contacts the top end of the drive rod 27. The spool 70 has a through hole 70a extending along the central axis a. The through hole 70a extends from the front end 70b to the rear end 70c of the spool. The spool 70 has a plurality of flow paths through which the hydraulic oil flows. In the illustrated embodiment, the through hole 70a of the spool 70 defines a main flow path mp through which the hydraulic oil flows. The main flow path mp extends from the front end 70b to the rear end 70c of the spool. Therefore, the main flow path mp opens at the control port portion ap. The spool 70 further includes a 1 st branch flow passage bp1 and a 2 nd branch flow passage bp2 extending from the main flow passage mp to the outer surface of the spool 70. The spool 70 has a 3 rd connecting flow path cp3 at the rear end in the axial direction thereof, which connects the main flow path mp with the preliminary chamber 41.
The valve unit 30 has a biasing member 80 disposed in the valve main body 40. The urging member 80 urges the spool 70 toward the drive lever 27. In other words, the urging member 80 urges the spool 70 rearward along the central axis a. The urging member 80 is, for example, a compression spring.
The spool 70 is always in contact with the drive rod 27 by the axial rearward biasing force received from the biasing member 80. Therefore, when the drive rod 27 moves forward along the central axis a, the spool 70 also moves forward along the central axis with respect to the valve body 40 by the pushing force from the drive rod 27. Conversely, when the drive rod 27 moves rearward along the central axis a, the spool 70 moves rearward along the central axis a while being held in contact with the drive rod 70 by the urging force from the urging member 80. The thrust force of the self-driving rod 27 on the spool 70 is of a magnitude corresponding to the exciting current of the solenoid coil 23. Therefore, by adjusting the magnitude of the exciting current applied to the solenoid coil 23, the position of the spool 70 in the axial direction can be controlled.
The spool 70 is switched to at least any one of the neutral position, the supply position, and the discharge position. Fig. 2 shows the electromagnetic proportional valve 1 with the spool 70 in the neutral position, fig. 3 shows the electromagnetic proportional valve 1 with the spool 70 in the supply position, and fig. 4 shows the electromagnetic proportional valve 1 with the spool 70 in the discharge position.
When the spool 70 is in the neutral position shown in fig. 2, the ports pp, tp, ap are blocked from each other. In this case, the hydraulic equipment connected to the control port ap is not supplied or discharged with the hydraulic oil.
When the spool 70 is located at the supply position shown in fig. 3, the control port portion ap is connected to the pressure source port portion pp via the main flow path mp and the 1 st branch flow path bp1, and the tank port portion tp is blocked from the other ports pp and ap. Thereby, the hydraulic device is supplied with the hydraulic oil from the pressure source P. Further, since the control port portion ap is connected to the 1 st solenoid chamber 14a via the main passage mp, the 3 rd connecting passage cp3, the preparation chamber 41, the 2 nd connecting passage cp2, the 2 nd solenoid chamber 14b, and the 1 st connecting passage cp1, the 1 st solenoid chamber 14a is maintained at the control pressure, which is the pressure of the hydraulic oil in the control port portion ap, when the spool 70 is located at the supply position. The 1 st solenoid chamber 14a and the space (for example, the 2 nd solenoid chamber 14 b) between the 1 st solenoid chamber 14a and the control port portion ap are maintained at the control pressure of the control port portion ap, and therefore, a part or all of these spaces are provided as pressure receiving chambers. For example, at least one of the 1 st solenoid chamber 14a and the 2 nd solenoid chamber 14b is set as a pressure receiving chamber maintained as a control pressure of the control port portion ap. The solenoid coil 23 is housed in the pressure-receiving chamber. At least a portion of the pressure chamber is delimited by a drive rod 27. At least a portion of the plenum is defined by a plunger 26.
When the spool 70 is in the discharge position shown in fig. 4, the control port portion ap is connected to the tank port portion tp via the main flow path mp and the 1 st branch flow path bp1, and the pressure source port portion pp is blocked from the other ports tp and ap. Thereby, the oil is discharged from the hydraulic device to the tank T.
Next, the operation of the electromagnetic proportional valve 1 will be described. When the solenoid coil 23 is not excited, the spool 70 is maintained at the discharge position shown in fig. 4 by the urging force of the urging member 80. At this time, as described above, the flow path from the control port portion ap to the tank port portion tp via the main flow path mp and the 2 nd branch flow path bp2 of the spool 70 is opened. Therefore, the oil is recovered from the hydraulic device connected to the control port portion ap to the tank T connected to the tank port portion tp.
From this state, when the solenoid coil 23 is excited, the plunger 26 is driven, and the plunger 26 moves axially forward together with the drive rod 27 against the biasing force from the biasing member 80. At this time, the tip of the drive rod 27 contacts the spool 70, so that thrust force in the axial forward direction acts on the spool 70. Under the urging force, the spool 70 moves from the discharge position to the neutral position shown in fig. 2. When the spool 70 is in the neutral position, the connection between the 1 st branch flow passage bp1 and the tank port tp is blocked while the connection between the 2 nd branch flow passage bp2 and the pressure source port pp is blocked. Therefore, when the spool 70 is in the neutral position, the discharge of oil from the hydraulic device connected to the control port ap and the supply of oil to the hydraulic device are not performed.
When a larger exciting current is applied to the solenoid coil 23, the plunger 26 and the drive rod 27 move further axially forward. The spool 70 reaches the supply position shown in fig. 3 by the pushing force received from the drive lever 27. When the spool 70 is positioned at the supply position, a flow path from the control port ap to the pressure source port pp via the main flow path mp and the 1 st branch flow path bp1 of the spool 70 is opened. Thereby, the oil is supplied from the pressure source P connected to the pressure source port pp to the hydraulic device connected to the control port ap. When the spool 70 is located at the supply position, the supply amount of oil from the pressure source P to the hydraulic device varies according to the area where the 1 st branch flow path bp1 overlaps the pressure source port portion pp, that is, the amount of overlap between the 1 st branch flow path bp1 and the pressure source port portion pp. More specifically, the larger the excitation current, the larger the overlap amount of the 1 st branch flow path bp1 and the pressure source port portion pp, and the more oil flows from the pressure source port portion pp to the control port portion ap. Therefore, the larger the exciting current, the larger the control voltage to be output to the control port portion ap.
As described above, the control port portion ap is connected to the 1 st solenoid chamber 14a via the main flow path mp, the 3 rd connecting flow path cp3, the preparation chamber 41, the 2 nd connecting flow path cp2, the 2 nd solenoid chamber 14b, and the 1 st connecting flow path cp 1. Therefore, the 1 st solenoid chamber 14a is maintained at the control pressure output from the control port portion ap during the period in which the spool 70 is located at the supply position. The pressure of the 1 st solenoid chamber 14a is detected by the pressure sensor 15, and an electric signal indicating the detected pressure is output from the pressure sensor 15 to the controller. As described above, the control pressure output from the electromagnetic proportional valve 1 can be detected without installing a pressure measuring port or an external pressure sensor between the electromagnetic proportional valve 1 and the hydraulic device to be controlled.
Next, an application example of the electromagnetic proportional valve 1 will be described with reference to fig. 5 and 6. Fig. 5 is a block diagram illustrating a reversing valve 100 including the electromagnetic proportional valve 1. As shown in the figure, the selector valve 100 includes a solenoid proportional valve 1 and a valve structure 2 that operates by a control pressure supplied from the solenoid proportional valve 1. The valve structure 2 includes a main spool, and the position of the main spool is switched by the control pressure output from the electromagnetic proportional valve 1 to adjust the supply amount of the hydraulic oil to a hydraulic cylinder, not shown.
Fig. 6 is a block diagram illustrating a construction machine 200 including the reversing valve 100. The work machine 200 includes a reversing valve 100. The construction machine is, for example, a hydraulic excavator that operates by hydraulic pressure. The work machine 200 includes various hydraulic cylinders. The hydraulic cylinders included in the construction machine 200 include a boom cylinder that drives a boom, an arm cylinder that drives an arm, a bucket cylinder that drives a bucket, and hydraulic cylinders other than these. The directional valve 100 controls the supply amount of hydraulic oil to a hydraulic cylinder included in the construction machine 200.
Next, the operational effects obtained by the above embodiment will be described. The electromagnetic proportional valve 1 includes: a pressure receiving chamber maintained as a control pressure supplied to a control object, and a pressure sensor 15 for detecting the control pressure in the pressure receiving chamber. Thus, it is not necessary to provide a pressure measurement port for acquiring the control pressure and a joint for mounting a pressure sensor outside the electromagnetic proportional valve 1. Therefore, with the electromagnetic proportional valve 1 of the above embodiment, the control pressure output from the electromagnetic proportional valve 1 can be detected by a simple mechanism. Further, since the pressure measurement port and the joint for the pressure sensor are not required, the connection module between the electromagnetic proportional valve 1 and the hydraulic equipment to be controlled can be made compact.
In the above-described embodiment, the pressure-receiving chamber is, for example, at least one of the 1 st solenoid chamber 14a and the 2 nd solenoid chamber 14b. In the illustrated embodiment, the pressure sensor 15 detects the pressure of the 1 st solenoid chamber 14 a. The pressure sensor 15 may also be provided to detect the pressure of the 2 nd solenoid chamber 14b. In this case, the pressure sensor 15 may be provided so as to be exposed to the 2 nd solenoid chamber 14b. Two pressure sensors 15 may also be provided to detect the control pressures in each of the 1 st solenoid chamber 14a and the 2 nd solenoid chamber 14b.
In the above embodiment, the pressure sensor 15 is provided in the housing 11. Thus, it is not necessary to provide a pressure sensor outside the electromagnetic proportional valve 1. Therefore, the control pressure of the electromagnetic proportional valve can be detected with a compact mechanism.
In the above embodiment, the pressure sensor 15 is provided in the lid 12 for sealing the opening of the housing 11. By providing the pressure sensor 15 in the cover for sealing the opening, the pressure sensor 15 is provided at a position close to the surface of the housing 11. This makes it possible to easily take out the detection signal of the pressure sensor 15 to the outside. For example, a signal line is provided between the pressure sensor 15 and the controller, and a detection signal of the pressure sensor 15 is transmitted to the controller via the signal line, and in this case, the signal line is easily routed.
The dimensions, materials, and arrangements of the respective constituent elements described in the present specification are not limited to those explicitly described in the embodiments, and the respective constituent elements may be modified to have any dimensions, materials, and arrangements that can be included in the scope of the present invention. In addition, components not explicitly described in the present specification may be added to the described embodiments, and a part of the components described in each embodiment may be omitted.
The specific shapes, arrangements, functions, and materials of the constituent members of the driving device 10 and the valve unit 30, which are explicitly shown in the present specification and the drawings, are examples. The shape, arrangement, function and materials of the respective constituent members of the driving device 10 and the valve unit 30 can be appropriately changed within a range not departing from the gist of the present invention. For example, the driving device 10 may drive the driving rod 27 to move axially rearward when the exciting current is applied to the solenoid coil 23.
Claims (7)
1. An electromagnetic proportional valve, comprising:
a valve unit having a spool movable in an axial direction and a control port portion disposed on one side of the spool in the axial direction and configured to supply a control pressure to a control target; and
A driving device, which has: a solenoid coil disposed on the other side of the spool in the axial direction, the solenoid coil varying the control pressure by an exciting current; a housing for receiving the solenoid coil; a pressure receiving chamber located in the housing and connected to the control port section; a drive rod defining at least a portion of the pressure-receiving chamber, the drive rod being moved in the axial direction due to an exciting current of the solenoid coil; and a plunger that defines at least a part of the pressure chamber, is provided to the drive rod,
The pressure-receiving chamber is divided into a 1 st solenoid chamber located on the rear side in the axial direction of the plunger and a2 nd solenoid chamber located on the front side in the axial direction of the plunger,
The plunger has a1 st connection flow path connecting the 1 st solenoid chamber and the 2 nd solenoid chamber,
The 2 nd solenoid chamber is connected to the control port portion via a 2 nd connection passage provided in the fixed core and a 3 rd connection passage along a radial direction provided on one side in an axial direction of the spool.
2. The electromagnetic proportional valve of claim 1, wherein,
The electromagnetic proportional valve includes a pressure sensor for detecting the control pressure in the pressure-receiving chamber.
3. An electromagnetic proportional valve, comprising:
a valve unit having a valve body, a control port portion disposed on one side in an axial direction of the valve body, and a spool movably housed in the valve body and changing a control pressure of the control port portion by using the axial position; and
A driving device, which has: a solenoid coil disposed on a side opposite to the control port portion with respect to the valve unit, the solenoid coil changing the axial position of the spool by an exciting current; a housing for receiving the solenoid coil; and a pressure receiving chamber located in the housing and connected to the control port section; a drive rod defining at least a portion of the pressure-receiving chamber, the drive rod being moved in the axial direction due to an exciting current of the solenoid coil; and a plunger that defines at least a part of the pressure chamber, is provided to the drive rod,
The pressure-receiving chamber is divided into a 1 st solenoid chamber located on the rear side in the axial direction of the plunger and a2 nd solenoid chamber located on the front side in the axial direction of the plunger,
The plunger has a1 st connection flow path connecting the 1 st solenoid chamber and the 2 nd solenoid chamber,
The 2 nd solenoid chamber is connected to the control port portion via a 2 nd connection passage provided in the fixed core and a 3 rd connection passage along a radial direction provided on one side in an axial direction of the spool.
4. The electromagnetic proportional valve of claim 3, wherein,
The housing includes a pressure sensor for detecting the control pressure in the pressure-receiving chamber.
5. The electromagnetic proportional valve of claim 4, wherein,
The electromagnetic proportional valve comprises a cover part which covers the pressure sensor and is arranged on the shell.
6. A reversing valve comprising the electromagnetic proportional valve of any one of claims 1 to 5.
7. A construction machine comprising the directional valve of claim 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019029906A JP7361475B2 (en) | 2019-02-21 | 2019-02-21 | solenoid proportional valve |
| JP2019-029906 | 2019-02-21 |
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| CN111594506A CN111594506A (en) | 2020-08-28 |
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| CN202010067482.8A Active CN111594506B (en) | 2019-02-21 | 2020-01-20 | Electromagnetic proportional valve |
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| JP (1) | JP7361475B2 (en) |
| KR (1) | KR20200102342A (en) |
| CN (1) | CN111594506B (en) |
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| KR102290137B1 (en) | 2021-06-08 | 2021-08-18 | 동해하이테크산업 주식회사 | Fire hose with untwist structure |
| KR20210079243A (en) | 2021-06-08 | 2021-06-29 | 동해하이테크산업 주식회사 | Fire hose with untwist structure |
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| CN104428569A (en) * | 2012-03-27 | 2015-03-18 | Brt控股有限公司 | Solenoid device with sensor |
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| CN104428569A (en) * | 2012-03-27 | 2015-03-18 | Brt控股有限公司 | Solenoid device with sensor |
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| JP7361475B2 (en) | 2023-10-16 |
| JP2020133803A (en) | 2020-08-31 |
| KR20200102342A (en) | 2020-08-31 |
| CN111594506A (en) | 2020-08-28 |
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