JP2011064240A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid valve capable of stably supporting a valve element at a valve opening position even when disturbance is caused in a flow of fluid flowing into a valve chamber due to an increased discharge amount of a pump, in order that, when the fluid valve is used as a discharge valve of the pump with effectively suppressed vibration of the valve element, pulsation is never amplified, and noise resulting from vibration is also prevented. <P>SOLUTION: The fluid valve is configured to open and close a valve unit by contacting and separating a spherical valve element 1 stored in a valve chamber 2 to and from a valve seat 3 and to cause fluid, in valve opening, to flow into the valve chamber 2 through an inflow passage 4 and outflow through an outflow passage. The outflow passage for sending the fluid flowing into the valve chamber 2 through the inflow passage 4 to the downstream is composed of a first outflow passage 6 and one or more second outflow passages 7. The flow passage resistance of the first outflow passage 6 is smaller than the total flow passage resistance of the second outflow passages. An outflow-side valve chamber internal passage 11 is contracted with the valve element 1 abutting on a valve element contact part 5, and in this state, the flow passage resistance of an inflow-side valve chamber internal flow passage 12 is larger than the total flow passage resistance of the second outflow passage 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a check valve employed in a vehicle brake hydraulic pressure control device or the like.

  For example, the vehicle brake hydraulic pressure control apparatus described above has a power-driven hydraulic pump, and the hydraulic pump incorporates a check valve at the discharge port for the purpose of preventing the backflow of the discharged liquid. ing. As a conventional example of the check valve, for example, there is one disclosed in Patent Document 1 below.

  The fluid valve (check valve) disclosed in Patent Document 1 applies a force of a coil spring to a spherical valve element housed in a valve chamber via a transmission member, and the valve element is used as a valve seat by the force. I'm seated. In addition, when the valve body is separated from the seat surface of the valve seat, the outflow path that sends the fluid flowing into the valve chamber downstream is perpendicular to the inflow path that communicates with the valve chamber (outflow with respect to the axis of the inflow path). The direction in which the axis of the road forms a right angle). Furthermore, the point of application of the force of the coil spring applied to the valve body via the transmission member is biased from the extension line of the axis of the inflow path to the side opposite to the side where the outflow path is formed.

  In the check valve of Patent Document 1, due to the structure described above, the valve element that has moved to the valve opening position due to the pressure difference acting on the pressure receiving surface is pressed against the wall surface on the outflow passage forming side of the valve chamber by the force of the coil spring. The valve body at this time comes into contact with the valve seat, the wall surface of the valve chamber, and the transmission member that receives the force of the coil spring at three points. By creating such a contact state, vibration due to pulsation of the valve body is suppressed.

JP 2004-068811 A

  In the check valve of Patent Document 1, the valve body contacts the valve seat, the wall surface of the valve chamber, and the transmission member on a surface parallel to the axis of the outflow path. In addition, the transmission member is a movable member using a ball or the like. If the fluid pressure introduced into the valve chamber fluctuates rapidly, the movable member may be displaced. For this reason, the valve body is not stably fixed at the valve opening position, and vibration suppression of the valve body may be insufficient.

  The check valve of Patent Document 1 remains uneasy about the pulsation of the piston pump for the above-described reason. In addition, since the pump discharge amount increases and the amount of fluid passing through the check valve increases, the flow of fluid around the valve body is disturbed, and the possibility that the valve body vibrates increases. If the vibration is severe, the valve body and the valve seat may have dents (scratches) and the sealing performance of the valve part may be lost.

  In order to prevent the vibration of the valve body from being effectively suppressed and to amplify the pulsation when used as a pump discharge valve, and to prevent noise caused by the vibration. As the amount of fluid passing through the valve increases, even if the flow of fluid around the valve body is likely to be disturbed, it is an object to stably support the valve body at the valve opening position. .

In order to solve the above problems, in the present invention, a check valve is
A spherical valve body, a valve chamber for housing the valve body, a valve seat facing the valve chamber for contacting and separating the valve body, and
An inflow passage that communicates with the valve chamber when the valve body is separated from a seating surface of the valve seat; a plurality of outflow passages that send the fluid that has flowed into the valve chamber from the inflow passage; and the plurality of outflow passages A joint flow path for joining the passages, and a valve body abutting portion formed in the valve chamber so as to face the valve seat,
The plurality of outflow paths are composed of a first outflow path and one or more second outflow paths,
The flow resistance of the first outflow path is smaller than the flow resistance of the second outflow path,
The valve body is pushed away from the valve seat by the fluid flowing into the valve chamber from the inflow path and comes into contact with the valve body contact portion, and in the contact state, the valve body and the valve body contact portion The outflow side valve chamber flow path formed between the first outflow path and the fluid flow to the first outflow path is stopped or reduced.
The total flow of the second outflow path is greater than the flow resistance of the inflow side valve chamber flow path formed between the valve body and the valve seat at a position where the valve body abuts on the valve body abutting portion. The road resistance was set to be large.

  Note that the flow resistance of the second outflow passage is larger than the flow passage resistance of the inflow side valve chamber formed between the valve body and the valve seat. It can be realized by a method such as making the total flow area of the second outflow path smaller than the area.

Preferred forms of this check valve are listed below.
(1) The flow path resistance of the first outflow path is made smaller than the flow path resistance of the inflow side valve chamber flow path.
(2) The flow path resistance of the first outflow path is made smaller than the total flow path resistance of the second outflow path. (3) The valve body abutting portion has a seat surface on which the valve body is seated to close the outflow side valve chamber flow path.
(4) The first outflow path is formed coaxially with the inflow path.
(5) The second outflow passage has an intersection angle with respect to the axis of the first outflow passage.
(6) The second outflow path is perpendicular to the axis of the first outflow path.

  The present invention also provides a hydraulic pump provided with a discharge valve using the above-described check valve as a discharge valve.

  In the check valve according to the present invention, the valve body is pushed and moved by the fluid flowing into the valve chamber from the inflow passage to leave the seat surface of the valve seat, and the valve portion configured by the valve body and the valve seat opens (valve opening). Do). In the initial stage of valve opening, the outflow side valve chamber flow path formed between the valve body and the valve body abutting portion is sufficiently open, and a large amount of fluid flowing into the valve chamber has a small flow path resistance. It flows into 1 outflow channel. The valve body is pushed away by the flow, and the valve body is pressed against the valve body abutting portion.

  In this state, the outflow side valve chamber flow path is contracted, so that the fluid flowing into the valve chamber flows out from the second outflow path. At this time, since the total flow path resistance of the second outflow path is larger than the flow path resistance of the inflow side valve chamber flow path, a difference occurs between the pressure in the valve chamber and the pressure in the combined flow path (the pressure in the valve chamber is large). . Then, the valve body is stably pressed against the valve body abutting portion by the pressure difference. Thereby, the support of the valve body at the valve opening position is stabilized, and the vibration of the valve body is effectively suppressed. Therefore, pulsation amplification and noise generation due to vibration of the valve body are prevented.

  The operation and effect of the preferred embodiment will be described later.

Sectional drawing which shows an example of the non-return valve of this invention Sectional drawing which shows the other example of the non-return valve of this invention Circuit diagram of the hydraulic pump of the present invention using the check valve of the present invention Sectional drawing which shows the further another example of the non-return valve of this invention

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a check valve of the present invention and a hydraulic pump using the check valve will be described below with reference to FIGS.

  FIG. 1 shows a first embodiment of the check valve of the present invention. The check valve 20 includes a spherical valve body 1, a valve chamber 2 that houses the valve body 1, a valve seat 3 that contacts and separates the valve body 1, and the valve body 1 from the seat surface 3 a of the valve seat 3. An inflow passage 4 communicating with the valve chamber 2 when separated, a valve body abutting portion 5 for abutting the valve body 1 separated from the seat surface 3a, and a fluid flowing into the valve chamber 2 from the inflow passage 4 downstream The first outflow path 6 and the second outflow path 7 to be sent out, and a combined flow path 8 connected to the outlets of the outflow paths to join the outflow paths.

  In the illustrated check valve 20, the valve seat 3 that faces the valve chamber 2 is formed integrally with the housing 9, but a separate valve seat may be attached to the housing 9. Further, the case 10 is fixed to the housing 9 and the valve chamber 2 is created by the case 10 and a part of the housing 9. However, the valve chamber 2 may be formed integrally with the housing 9.

  The outflow path for flowing the fluid flowing into the valve chamber 2 from the inflow path 4 to the combined flow path 8 is composed of the first outflow path 6 and the second outflow path 7. The number of installed second outflow passages 7 is not limited to one. There may be a plurality of the second outflow paths 7.

  In the illustrated check valve 20, the first outflow path 6 is disposed on an extension of the inflow path 4 (coaxial with the axis L <b> 1 of the inflow path 4) with the valve chamber 2 interposed therebetween. And the valve body contact part 5 is provided in the opening end with respect to the valve chamber 2 of the 1st outflow path 6. The illustrated valve body abutting portion 5 has a seat surface 5a (this is not essential) on which the valve body 1 is seated, and the valve body 1 is seated on the seat surface 5a. The outflow side valve chamber passage 11 formed between the valve body abutting portion 5 is closed.

  The flow path resistance of the first outflow path 6 is smaller than the flow path resistance of the second outflow path 7. When there are a plurality of second outflow passages 7, the flow passage resistance of the first outflow passage 6 is more than the total flow passage resistance compared to the total flow passage resistance of all the second outflow passages 7. Make it smaller. It is possible to do so by making a difference in the channel area.

  The flow resistance of the second outflow passage 7 is that the valve body 1 is in contact with the valve body contact portion 5 (sitting on the seat surface 5a), that is, the valve body 1 and the valve seat 3 at the chain line position in FIG. Is set to be larger than the flow path resistance of the inflow side valve chamber flow path 12 formed between the two. Also in this case, when there are a plurality of second outflow passages 7, the total flow passage resistance of all the second outflow passages 7 is compared with the flow passage resistance of the inflow side valve chamber passage 12. Sets the magnitude relation of the channel resistance of the channel. This can be set by making a difference in the channel area.

  In the check valve 20 configured as described above, the valve body 1 is pushed and moved by the fluid flowing into the valve chamber 2 from the inflow path 4, and the valve body 1 is opened away from the seat surface 3 a of the valve seat 3. At the initial stage of opening the valve, as already described, the outflow side valve chamber flow path 11 is sufficiently open, and most of the fluid flowing into the valve chamber 2 flows into the first outflow path 6 having a small flow path resistance. . The valve body 1 is washed away by the flow and pressed against the valve body abutting portion 5.

  As a result, the outflow side valve chamber flow path 11 is reduced, and the fluid flowing into the valve chamber 2 flows out of the second outflow path 7. At this time, a pressure difference is generated between the valve chamber 2 and the combined flow path 8 due to the difference in flow path resistance between the second outflow path 7 and the inflow side valve chamber flow path 12, and the valve body 1 is caused to contact the valve body abutting portion 5 by the pressure difference. Can be pressed stably. For this reason, the support of the valve body 1 at the valve opening position is stabilized, and the vibration of the valve body 1 is effectively suppressed.

  As a preferred configuration, the illustrated check valve has a flow resistance of the first outflow path 6 smaller than that of the inflow side valve chamber flow path 12. Thereby, pressing of the valve body 1 to the valve body contact part 5 in the initial stage of valve opening becomes smooth.

  Further, the flow resistance of the first outflow passage 6 is made smaller than that of the second outflow passage 7 (total flow resistance when there are a plurality of second outflow passages). The fluid easily flows to the first outflow path 6 side, which helps to smoothly press the valve body 1 against the valve body abutting portion 5.

  Further, the second outflow path 7 is perpendicular to the axis L2 of the first outflow path 6, and this also facilitates the flow of the initial fluid to the first outflow path 6 side, There is an effect of facilitating the pressing of the valve body 1 to the contact portion 5.

  As shown in FIG. 2, the second outflow passage 7 may be disposed on a line that obliquely intersects the axis L <b> 2 of the first outflow passage 6. The second outflow passage 7 of the check valve 20 in FIG. 2 is inclined in a direction in which the outlet returns to the near side when viewed from the inflow passage 4 side, and the fluid that has flowed into the valve chamber 2 passes through the second outflow passage 7. This creates a situation where the flow is reversed. Therefore, compared with the second outflow path in FIG. 1 and the second outflow path in which the direction of inclination is opposite to that in FIG. It has the effect of facilitating fluid flow.

As shown in FIG. 4, the check valve of the present invention may include a biasing means 13 that biases the valve body in the valve closing direction and presses it against the seat surface of the valve seat. The biasing means 13 gives a degree of freedom in setting the valve opening pressure.
When the urging means 13 is a spring, the urging force (spring load) of the means increases in the course of movement from the valve closing position of the valve body 1 to the valve body abutting portion 5. The force acting on the valve body 1 is increased by the pressure difference due to the difference in flow path resistance between the inflow side valve chamber flow path 12 and the first outflow path 6 and the second outflow path 7 from the increase in the urging force. Channel resistance is set. For this reason, the valve body 1 moves smoothly to the valve body contact portion 5.
According to the configuration of the check valve of the present invention, the flow of the fluid around the valve body can be increased without increasing the flow path diameter and increasing the flow path area without using a method for preventing the occurrence of turbulent flow. Even in the case of turbulent flow, it is possible to stabilize the position of the valve body when the valve is opened and to generate sound due to vibration and reduce pulsation amplification without increasing the size of the fluid valve or the like.

  The check valve of the present invention described above can be used as a discharge valve for preventing the backflow of liquid discharged from the hydraulic pump to the pump chamber or a check valve incorporated in the hydraulic circuit.

  FIG. 3 shows a hydraulic pump that is driven by power and sucks and discharges liquid. The above-described check valve 20 is provided as a discharge valve at the discharge port. The hydraulic pump 21 may be a piston pump, but if the metering pump is a gear pump or the like, the effect of the present invention is remarkably exhibited.

  In applications where pulsation is avoided, metering pumps such as gear pumps, vane pumps, and screw pumps are used as hydraulic pumps. Even when the metering pump is used, when the turbulent flow region is reached due to an increase in flow rate, vortexing of the flow due to turbulence occurs, and the flow further increases, resulting in finer vortices and slight vibration of the valve body. May be amplified and the valve body may vibrate violently. As a result, adverse effects on the durability of the valve section and the generation of noise are unavoidable, and the meaning of using an expensive metering pump is lost. By providing the fluid valve of the present invention as a discharge valve, the advantages of the metering pump can be utilized.

  The fluid valve according to the present invention includes circuit components of a vehicle brake fluid pressure control device having an electronic control function such as ABS (anti-lock brake system), ESC (Electronic Stability Control), and fluid pressures other than the brake fluid pressure control device. It can be effectively used as a circuit component of the apparatus.

DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve chamber 3 Valve seat 3a Seat surface 4 Inflow path 5 Valve body contact part 5a Seat surface 6 1st outflow path 7 2nd outflow path 8 Joint flow path 9 Housing 10 Case 11 Outflow side valve chamber flow path 12 Inflow Side valve chamber 13 Energizing means 20 Check valve 21 Hydraulic pump

Claims (8)

A spherical valve body (1);
A valve chamber (2) for accommodating the valve body (1);
A valve seat (3) facing the valve chamber (2) for contacting and separating the valve body (1);
An inflow path (4) communicating with the valve chamber (2) when the valve body (1) is separated from the seat surface (3a) of the valve seat (3);
A plurality of outflow passages for sending the fluid flowing into the valve chamber (2) from the inflow passage (4) downstream;
A merge channel (8) for merging the plurality of outflow channels;
A valve body contact portion (5) formed in the valve chamber (2) so as to face the valve seat (3);
The plurality of outflow paths are constituted by a first outflow path (6) and one or more second outflow paths (7),
The first outflow passage (6) has a flow passage resistance smaller than that of the second outflow passage (7),
The valve body (1) contacts the valve body contact portion (5), and the outflow side formed between the valve body (1) and the valve body contact portion (5) in the contact state. The valve chamber flow path (11) is reduced so that the flow of fluid to the first outflow path (6) is stopped or reduced.
An inflow side valve chamber flow path (12) formed between the valve body (1) and the valve seat (3) at a position where the valve body (1) is in contact with the valve body contact portion (5). A check valve in which the total flow path resistance of the second outflow path (7) is made larger than the flow path resistance of.   The check valve according to claim 1, wherein a flow path resistance of the first outflow path (6) is smaller than a flow path resistance of the inflow side valve chamber flow path (12).   The check valve according to claim 1 or 2, wherein a flow path resistance of the first outflow path (6) is smaller than a total flow path resistance of the second outflow path (7).   The said valve body contact part (5) has a seat surface (5a) which makes the said valve body (1) seat and closes the said outflow side valve chamber flow path (11). The check valve according to any one of 3 above.   The check valve according to any one of claims 1 to 4, wherein the first outflow path (6) is formed coaxially with the inflow path (4).   The fluid valve according to any one of claims 1 to 5, wherein the second outflow passage (7) has an intersection angle with respect to the axis of the first outflow passage (6).   The fluid valve according to claim 6, wherein the second outflow path (7) is perpendicular to the axis of the first outflow path (6).   A hydraulic pump having a pump that is driven by power and sucks and discharges liquid, and has the check valve (20) according to any one of claims 1 to 7 as a discharge valve at a discharge port of the pump.

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