WO2017208778A1

WO2017208778A1 - Fluid valve and method for manufacturing same

Info

Publication number: WO2017208778A1
Application number: PCT/JP2017/017972
Authority: WO
Inventors: 康光大見
Original assignee: 株式会社デンソー
Priority date: 2016-06-02
Filing date: 2017-05-12
Publication date: 2017-12-07
Also published as: JP2017215026A

Abstract

This fluid valve is provided with: a main body (11) having at least one opening (11b, 11c); a valve body (12) which adjusts the opening degree of said at least one opening (11b, 11c) by rotating inside the main body (11); a sealing member (13) which elastically deforms between the main body (11) and the valve body (12); and a sliding coat (14) which is provided on the outer surface of the valve body (12) and rotates together with the valve body (12) to slide on the seal member (13) by rotating. The method for manufacturing the fluid valve includes a heating step for: covering the outside of the valve body (12) with the sliding coat (14), by using, as the sliding coat (14), a coat obtained by forming a heat shrinkable material into a cylinder shape; heating the sliding coat (14) to bring the sliding coat (14) into close contact with the outer peripheral surface of the valve body (12). The method for manufacturing the fluid valve includes an insert-molding step for insert-molding the valve body (12) and the sliding coat (14).

Description

Fluid valve and manufacturing method thereof

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2016-110988 filed on June 2, 2016, the contents of which are incorporated herein by reference.

The present disclosure relates to a fluid valve used for a fluid flow path and a method for manufacturing the fluid valve.

Conventionally, Patent Document 1 describes a flow path switching valve including a valve body, a valve body, and a seal member. The seal member is formed in a cylindrical shape with an elastic material, and is accommodated in the valve chamber of the valve body. The valve body is accommodated inside the seal member in the valve chamber of the valve body.

When the valve body is driven to rotate, the valve body rotates and slides on the inner peripheral surface of the seal member, and the flow path is opened or closed or switched.

Since the inner diameter of the seal member is slightly smaller than the outer diameter of the valve body, the seal member is stretched by the valve body to generate an elastic force, and the seal member comes into close contact with the valve body to exert the sealing force.

In this prior art, since the seal member is integrally formed in a cylindrical shape, the number of parts of the seal member can be reduced as compared with the case where the seal member is divided into a plurality of plate-like members.

Japanese Patent Laid-Open No. 2015-34560

In the above prior art, since the sealing member is brought into close contact with the valve body and exhibits a sealing force, sliding resistance is increased between the valve body and the sealing member. Therefore, it is necessary to increase the torque of the motor that drives the valve body, which increases the size of the motor, increases the weight of the motor, and increases the power consumption of the motor.

Therefore, the present inventor studied to apply a fluororesin sliding film on the inner peripheral surface of the sealing member in order to improve the sliding between the valve body and the sealing member.

However, if a sliding coating of fluororesin is attached to the sealing member, the elasticity of the sealing member is hindered by the sliding coating, so that a stable sealing force cannot be exhibited.

In addition, when the sliding coating is applied to the seal member, it is necessary to press the sliding coating against the sealing member. Therefore, it is very difficult to apply the sliding coating to the inner peripheral surface of the sealing member. That is, when the sealing member is divided and formed into a plurality of plate-like members, it is easy to press the sliding coating against the plate-like sealing member, whereas the sealing member is cylindrical as in the above prior art. When formed, it is very difficult to press the sliding coating against the inner peripheral surface of the cylindrical sealing member.

Therefore, the present inventor also examined a proposal to mold the valve body itself with a fluororesin. However, since fluororesin is difficult to mold with a mold, it is manufactured by cutting out from a fluororesin rod or lump. It is necessary to do, and productivity is bad and is not realistic.

This indication aims at improving the slidability of a valve body and a sealing member in view of the above-mentioned point.

In order to achieve the above object, in the fluid valve according to the first aspect of the present disclosure, a main body having at least one opening, and a valve body that adjusts the opening of the at least one opening by rotating inside the main body. And a seal member that is elastically deformed between the main body and the valve body, and a sliding coating that is provided on the outer surface of the valve body and rotates with the valve body and slides on the seal member.

According to this, since the sliding coating is provided on the outer surface of the valve body, it is avoided that the elasticity of the sealing member is hindered by the sliding coating as in the case where the sliding coating is provided on the sealing member. it can. Also, the sliding coating can be easily provided as compared with the case where the sliding coating is provided on the seal member. Therefore, the slidability between the valve body and the seal member can be improved.

In order to achieve the above object, in the fluid valve manufacturing method according to the second aspect of the present disclosure, a coating formed in a tubular shape with a heat-shrinkable material is used as the sliding coating, and the sliding coating is formed outside the valve body. After covering, a heating step is included in which heat is applied to the sliding coating to bring the sliding coating into close contact with the outer peripheral surface of the valve body.

Thereby, since the sliding coating can be satisfactorily provided on the outer surface of the valve body, the slidability between the valve body and the seal member can be improved.

In order to achieve the above object, the fluid valve manufacturing method of the third aspect of the present disclosure includes an insert molding step of insert molding the valve body and the sliding coating.

Thereby, it is possible to obtain the same effect as that of the fluid valve manufacturing method of the second aspect.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
It is sectional drawing which shows the fluid valve | bulb in 1st Embodiment. FIG. 2 is a sectional view taken along the line II-II in FIG. It is a perspective view of the valve body and seal member in a 1st embodiment. It is explanatory drawing explaining the assembly | attachment process of the valve body and sliding film in 1st Embodiment. It is explanatory drawing explaining the thermal contraction process of the sliding film in 1st Embodiment. It is explanatory drawing explaining the assembly | attachment process of the valve body and sliding film in 2nd Embodiment. It is explanatory drawing explaining the assembly | attachment process of the valve body and sliding film in 2nd Embodiment. It is explanatory drawing explaining the insert molding process of the valve body and sliding film in 3rd Embodiment. It is a perspective view of the valve body and seal member in the 1st example of other embodiments. It is a perspective view of the valve body and seal member in the 2nd example of other embodiments.

Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A fluid valve 10 shown in FIGS. 1 and 2 is a valve for switching the flow of fluid. The fluid valve 10 is, for example, a valve that switches the flow of cooling water that flows out from the engine of the vehicle.

Next, the structure of the fluid valve 10 will be described. The fluid valve 10 has a valve body 11. The valve body 11 is a housing that forms the main body of the fluid valve 10 and is formed of resin. The valve body 11 is formed with first to third ports 11a to 11c. The first to third ports 11a to 11c form an inflow port through which fluid flows or an outflow port from which fluid flows out. The first to third ports 11a to 11c are pipe connection portions to which fluid pipes (not shown) are connected.

The first port 11 a is formed on the bottom surface of the valve body 11. The second port 11 b and the third port 11 c are formed on the side surface portion of the valve body 11.

The fluid valve 10 has a valve body 12, a packing 13 and a sliding coating 14 shown in FIG. When the valve body 12 rotates in the internal space of the valve body 11, the opening degree of the second port 11b and the third port 11c is adjusted.

The valve body 12 is formed in a substantially cylindrical shape with resin. The valve body 12 is provided with a drive shaft 12a connected to an actuator side (not shown). The valve body 12 is rotationally driven by an actuator (not shown).

The outer peripheral surface of the valve body 12 is opposed to the second port 11b and the third port 11c with a predetermined gap. A communication port 12 c is formed on the outer peripheral surface of the valve body 12.

A packing 13 is disposed between the outer peripheral surface of the valve body 12 and the inner peripheral surface of the valve body 11. The packing 13 is a seal member that prevents leakage of cooling water between the outer peripheral surface of the valve body 12 and the inner peripheral surface of the valve body 11.

The packing 13 is formed in a cylindrical shape with an elastic material such as rubber, and is elastically deformed between the valve body 11 and the valve body 12. In the packing 13,

openings

13 b and 13 c that overlap with the second port 11 b and the third port 11 c of the valve body 11 are formed.

A sliding coating 14 is provided on the outer peripheral surface of the valve body 12. The sliding coating 14 is a sliding member that ensures slidability between the outer peripheral surface of the valve body 12 and the inner peripheral surface of the packing 13.

The sliding coating 14 is made of a fluorine resin. Examples of the fluororesin include PTFE (tetrafluorinated resin), PFA (perfluoroalkoxy fluororesin), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), ETFE (ethylene / tetrafluoroethylene copolymer). Etc.

The sliding coating 14 has a substantially cylindrical film shape, and is in close contact with the outer peripheral surface of the valve body 12 by heat shrinkage. The sliding coating 14 is continuously connected in the circumferential direction of the valve body 12 (in other words, the rotational direction of the valve body 12). That is, the sliding coating 14 is not divided into a plurality of pieces in the circumferential direction of the valve body 12. In the sliding coating 14, a communication hole 14 a that is superposed on the communication port 12 c of the valve body 12 is formed.

The portion of the outer peripheral surface of the valve body 12 where the communication port 12c is formed has a flat shape. Therefore, the communication port 12 c of the valve body 12 and the communication hole 14 a of the sliding coating 14 are separated from the inner peripheral surface of the cylindrical packing 13. Thereby, when the valve body 12 rotates, it can suppress that the peripheral part of the communicating hole 14a of the sliding coating 14 is caught in the packing 13, or is turned up from the valve body 12.

Next, a procedure for bringing the sliding coating 14 into close contact with the outer peripheral surface of the valve body 12 by heat shrinkage will be described with reference to FIGS.

First, as the sliding coating 14, a coating formed into a cylindrical shape with a heat-shrinkable material (specifically, a fluorine-based resin that thermally shrinks) is used. As shown in FIG. 4, the inner circumferential length of the sliding coating 14 at this time is larger than the outer circumferential length of the valve body 12, and the axial length of the sliding coating 14 at this time is the valve body 12. Among these, the dimension is larger than the axial length of the portion sliding with the packing 13.

Next, in the heating step, the sliding coating 14 is placed on the outside of the valve body 12 to apply heat. As a result, the sliding coating 14 is thermally contracted. The two-dot chain line in FIG. 5 indicates the shape of the sliding coating 14 before thermal contraction. The sliding coating 14 adheres to the outer peripheral surface of the valve body 12 by the thermal contraction of the sliding coating 14.

4 shows the shape of the sliding coating 14 after heat shrinking. The sliding coating 14 after the heat shrinkage extends to the upper surface and the lower surface of the valve body 12. That is, the sliding coating 14 is in close contact with not only the outer peripheral surface of the valve body 12 but also the upper and lower surfaces of the valve body 12. Thereby, the sliding coating 14 and the valve body 12 are engaged with each other in the axial direction of the valve body 12, and the sliding coating 14 is prevented from being displaced in the axial direction of the valve body 12.

As shown in FIG. 4, a recess 12 d is formed on the outer peripheral surface of the valve body 12. When the sliding coating 14 is thermally contracted and enters and closes into the recess 12 d of the valve body 12, the sliding coating 14 and the valve body 12 are engaged with each other in the circumferential direction. Prevents deviation in the circumferential direction.

In FIG. 4, for easy understanding, the communication port 12 c is illustrated in the single-state valve body 12, and the communication hole 14 a is illustrated in the single-state sliding coating 14. After the contact with the body 12, the communication hole 14a of the sliding coating 14 and the communication port 12c of the valve body 12 may be simultaneously drilled in the hole machining step.

Next, the operational effects of the above configuration will be described. Since the sliding coating 14 is provided on the outer peripheral surface of the valve body 12, the sliding resistance between the outer peripheral surface of the valve body 12 and the inner peripheral surface of the packing 13 can be reduced when the valve body 12 is rotationally driven. .

Therefore, a low-load low-torque motor can be employed as a drive mechanism (specifically, an actuator, a gear, etc.) that rotationally drives the valve body 12, so that the drive mechanism that rotationally drives the valve body 12 can be downsized. As a result, the fluid valve 10 can be reduced in size, weight and power saving, and the level of vibration and noise can be reduced.

Also, since the load on the drive mechanism that rotationally drives the valve body 12 is reduced, wear of sliding parts such as gears can be suppressed, and the life of the fluid valve 10 can be improved.

In the fluid valve 10 of the present embodiment, the sliding coating 14 is provided on the outer surface of the valve body 12 and rotates with the valve body 12 to slide with the packing 13.

According to this, since the sliding coating 14 is provided on the outer surface of the valve body 12, the elasticity of the packing 13 is hindered by the sliding coating 14 as in the case where the sliding coating 14 is provided on the packing 13. Can be avoided. Further, the sliding coating 14 can be easily provided as compared with the case where the sliding coating 14 is provided on the inner peripheral surface of the cylindrical packing 13. Therefore, the slidability between the valve body 12 and the packing 13 can be improved.

In the fluid valve 10 of the present embodiment, the valve body 12 and the sliding coating 14 are engaged with each other in at least one of the axial direction of the valve body 12 and the rotation direction of the valve body 12. Thereby, it can suppress that the sliding coating 14 shifts | deviates from the valve body 12. FIG.

In the fluid valve 10 of the present embodiment, the sliding coating 14 has a shape continuously connected in the circumferential direction of the valve body 12. According to this, since the joint of the sliding coating 14 is not formed in the circumferential direction of the valve body 12, the sliding coating 14 is prevented from being caught by the packing 13 or being turned up from the valve body 12 when the valve body 12 rotates. it can.

In the manufacturing method of the fluid valve 10 according to the present embodiment, a coating formed in a cylindrical shape with a heat-shrinkable material is used as the sliding coating 14, and the sliding coating 14 is put on the outside of the valve body 12, and then the sliding coating is applied. 14 includes a heating step in which heat is applied to 14 to bring the sliding coating 14 into close contact with the outer peripheral surface of the valve body 12. Thereby, the sliding coating 14 can be easily provided on the outer surface of the valve body 12.

The manufacturing method of the fluid valve 10 of the present embodiment includes a hole machining step of simultaneously machining the hole shape in the sliding coating 14 and the valve body 12 after the heating step. Thereby, the communication hole 14a of the sliding coating 14 and the communication port 12c of the valve body 12 can be formed with high accuracy.

(Second Embodiment)
In the above embodiment, the sliding coating 14 is in close contact with the outer peripheral surface of the valve body 12 by heat shrinkage. In this embodiment, as shown in FIGS. 6 and 7, the sliding coating 14 is a spring member. 15 is fixed to the outer peripheral surface of the valve body 12.

A groove 12 e is formed on the outer peripheral surface of the valve body 12. The groove part 12e is formed over the whole area of the outer peripheral surface of the valve body 12 in the axial direction.

The sliding coating 14 enters the groove 12e of the valve body 12. The sliding coating 14 is sandwiched between the groove 12 e of the valve body 12 and the spring member 15. The spring member 15 is an elastic member that is elastically deformed. The spring member 15 has a cylindrical shape having a notch. The sliding coating 14 is fixed to the outer peripheral surface of the valve body 12 by the spring member 15 spreading in the groove 12e by its own elastic force.

A positioning pin 12 f is formed on the outer peripheral surface of the valve body 12. A positioning hole 14 b is formed in the sliding coating 14. The positioning pin 12 f of the valve body 12 is inserted into the positioning hole 14 b of the sliding coating 14. Thereby, since the sliding coating 14 and the valve body 12 engage with each other in the circumferential direction and the axial direction, the sliding coating 14 is prevented from shifting in the circumferential direction and the axial direction of the valve body 12.

Next, the procedure for fixing the sliding coating 14 to the valve body 12 will be described. First, as shown in FIG. 6, a cylindrical sliding coating 14 is placed on the outside of the valve body 12. The inner peripheral length of the sliding coating 14 at this time is larger than the outer peripheral length of the valve body 12.

Next, the spring member 15 is fitted into the groove 12 e from the outside of the valve body 12 and the sliding coating 14. As a result, the sliding coating 14 comes into close contact with the outer peripheral surface of the valve body 12. A two-dot chain line in FIG. 7 indicates the shape of the sliding coating 14 before the spring member 15 is fitted. Since the sliding member 14 is drawn into the groove 12e by fitting the spring member 15 into the groove 12e, the sliding member 14 comes into close contact with the outer peripheral surface of the valve body 12.

The drilling of the communication hole 14 a of the sliding coating 14 and the communication port 12 c of the valve body 12 may be performed before the sliding coating 14 is fixed to the valve body 12, or the sliding coating 14 is attached to the valve body 12. It may be performed after fixing.

Also in the present embodiment, the same operational effects as in the first embodiment can be achieved.

In the fluid valve 10 of this embodiment, a groove 12e into which the sliding coating 14 enters is formed on the outer surface of the valve body 12, and the spring member 15 is fitted into the groove 12e from the outside of the sliding coating 14. Thus, the sliding coating 14 is fixed to the groove 12e.

Thereby, the excess of the dimension of the sliding coating 14 can be absorbed by the groove 12e, and the fixing of the sliding coating 14 to the outer peripheral surface of the valve body 12 can be facilitated.

(Third embodiment)
In this embodiment, the sliding coating 14 and the valve body 12 are insert-molded. Insert molding is a method of integrating resin and insert parts by inserting an insert part into a mold, closing the mold, and pouring resin.

The procedure for insert-molding the sliding coating 14 and the valve body 12 will be described with reference to FIG. First, in the setting step, the sliding coating 14 formed in a cylindrical shape is set in the mold 20. Next, in the insert molding step, the sliding coating 14 and the valve body 12 are insert-molded by filling the mold 20 with a molten resin. In the take-out step, the insert-formed sliding coating 14 and the valve body 12 are taken out from the mold 20.

In this embodiment, similarly to the second embodiment, the positioning pin 12f may be formed on the outer peripheral surface of the valve body 12, and the positioning hole 14b may be formed in the sliding coating 14. By inserting the positioning pin 12 f of the valve body 12 into the positioning hole 14 b of the sliding coating 14, it is possible to prevent the sliding coating 14 from shifting in the circumferential direction and the axial direction of the valve body 12.

The manufacturing method of the fluid valve 10 of the present embodiment includes an insert molding process in which the valve body 12 and the sliding coating 14 are insert-molded. Also in this embodiment, the sliding coating 14 can be provided on the outer surface of the valve body 12 as in the above embodiment.

The above embodiments can be appropriately combined. The above embodiment can be variously modified as follows, for example. A modification of the above embodiment will be described.

(1) In the above embodiment, the valve body 12 and the sliding coating 14 are formed in a cylindrical shape, but the shapes of the valve body 12 and the sliding coating 14 are not limited thereto.

For example, as shown in FIG. 9, the valve body 12 and the packing 13 may be formed in a cylindrical shape having a frustoconical outer shape. As shown in FIG. 10, the valve body 12 and the packing 13 may be formed in a cylindrical shape having a spherical outer shape.

That is, the valve body 12 only needs to have a circular outer shape when cut in a direction perpendicular to the drive shaft 12a, and the packing 13 is cut in a direction perpendicular to the drive shaft 12a. It is sufficient that the inner shape of the cross section at the time is circular.

(2) In the above embodiment, the first to third ports 11a to 11c are formed in the valve body 11. However, the present invention is not limited to this, and the number and arrangement of the ports of the valve body 11 can be changed as appropriate. .

(3) In the above embodiment, the communication port 12c is formed on the outer peripheral surface of the valve body 12, but the number of the communication ports 12c can be appropriately changed.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A body (11) having at least one opening (11b, 11c);
A valve body (12) for adjusting the opening of the at least one opening by rotating inside the body;
A seal member (13) elastically deformed between the main body and the valve body;
A fluid valve provided with a sliding coating (14) provided on an outer surface of the valve body and rotating with the valve body and sliding with the seal member.
The fluid valve according to claim 1, wherein the valve body and the sliding coating are engaged with each other in at least one of a circumferential direction and an axial direction of the valve body.
The fluid valve according to claim 1 or 2, wherein the sliding coating has a shape continuously connected in a circumferential direction of the valve body.
A groove (12e) into which the sliding coating enters is formed on the outer surface of the valve body,
The fluid valve according to any one of claims 1 to 3, further comprising an elastic member (15) fitted into the groove portion from the outside of the sliding coating to fix the sliding coating to the groove.
A body (11) having at least one opening (11b, 11c);
A valve body (12) for adjusting the opening of the at least one opening by rotating inside the body;
A seal member (13) elastically deformed between the main body and the valve body;
A fluid valve manufacturing method comprising a sliding coating (14) provided on an outer surface of the valve body and rotating with the valve body and sliding with the seal member,
As the sliding coating, using a coating molded into a cylindrical shape with a heat shrink material,
A method of manufacturing a fluid valve, comprising: a heating step of covering the outer surface of the valve body with the sliding coating, and then applying heat to the sliding coating to bring the sliding coating into close contact with the outer peripheral surface of the valve body.
6. The method of manufacturing a fluid valve according to claim 5, further comprising a hole machining step of simultaneously machining a hole shape in the sliding coating and the valve body after the heating step.
A body (11) having at least one opening (11b, 11c);
A valve body (12) for adjusting the opening of the at least one opening by rotating inside the body;
A seal member (13) elastically deformed between the main body and the valve body;
A fluid valve manufacturing method comprising a sliding coating (14) provided on an outer surface of the valve body and rotating with the valve body and sliding with the seal member,
A fluid valve manufacturing method including an insert molding step of insert molding the valve body and the sliding coating.