JP2003329137A - Sealing ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing ring in a shape with which it is easy to secure both durability and sealability. <P>SOLUTION: This sealing ring which is a heat resisting material 50 having a square cross section and formed in a C ring cut off at one part in a peripheral direction is attached between opposite faces of a pair of members provided in a relatively reciprocally movable manner in one direction in the state where it is elastically deformed in a radial direction by elastic stability so that the circumferential surface is pressed on one member by elastic restoring force, and also in the state where its relative movement in a reciprocating direction to the other member is prevented. Thereby, the circumferential surface is sled on one member along with a relative reciprocal movement of the pair of members to prevent the movement of the molten metal passing between the opposite faces. The thickness T in the radial direction of the heat resisting material ring is set to be 0.02 to 0.2 times the outer diameter K of the ring. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a heat-resistant material having a quadrangular cross section, which is formed in a C-shaped ring which is divided at one location in the circumferential direction, and is provided so as to be relatively reciprocable in one direction. Relative to the other member in the reciprocating direction with the peripheral surface elastically deformed in a radial direction so as to be pressed against one member by an elastic restoring force between the facing surfaces of the pair of members. By mounting in a state in which the movement is blocked, the peripheral surface slides with respect to one of the members in accordance with the relative reciprocating movement of the pair of members, and the movement of the molten metal between the facing surfaces is prevented. It relates to a sealing ring which is designed to be able to.

[0002]

2. Description of the Related Art For example, in a hot water supply device for supplying molten metal in a melting furnace to a casting device, a suction / discharge passage 9 for molten metal C is communicated with a cylinder case 4 as shown in FIGS. Then, by moving the piston 5 in the cylinder case 4 to one side, the molten metal C in the smelting furnace D can be sucked into the cylinder case 4 through the intake / exhaust passage 9, and by moving the piston 5 to the other side, A molten metal pump 1 capable of discharging the molten metal C in the case 4 through a suction / discharge passage 9.
And the molten metal C discharged through the intake / exhaust passage 9 into the mold B1.
Inlet pipe 26 communicating with the supply pipe 2 for supplying
The exhaust passage 27 and the intake / exhaust passage 9 communicating with the supply pipe 2 are formed to open to the valve body moving space 21, and the intake passage 26 is communicated with the intake / exhaust passage 9 as shown in FIG. The suction position that blocks communication between the suction passage 27 and the suction / discharge passage 9, and the discharge position that communicates the discharge passage 27 with the suction / discharge passage 9 to block communication between the suction passage 26 and the suction / discharge passage 9 as shown in FIG. A switching valve 3 equipped with a valve body that can be operated to move up and down is provided, and when the piston 5 is moved upward while the valve body 19 is moved to the suction position, the molten metal C in the melting furnace D is The cylinder case 4
It is configured so that the molten metal C in the cylinder case 4 is discharged to the supply pipe 2 by an operation of moving the piston 5 downward with the piston 19 being sucked into the valve body 19 and moved to the discharge position. In such a water heater, a predetermined amount of molten metal C can be sucked into the cylinder case 4 accurately by the reciprocating movement of the piston 5, and the sucked predetermined amount of molten metal C can be accurately transferred to the casting device B. It is necessary to provide so that hot water can be supplied to.

In such a case, the sealing ring serves as the piston ring 8 in the moving direction of the cylinder case 4 and the piston 5 (an example of a pair of members provided so as to be capable of relative reciprocating movement in one direction). Between the facing surfaces facing each other in a direction orthogonal to each other, the circumferential surface is elastically deformed in the diameter reducing direction so as to be pressed against the cylinder case (an example of one member) 4 by an elastic restoring force, and the piston (An example of the other member) It is fitted in an annular groove 5a formed in 5 to prevent relative movement in the reciprocating movement direction with respect to the piston 5, and the piston 5 is reciprocatingly moved with respect to the cylinder case 4. With this, by sliding the outer peripheral surface of the piston ring 8 with respect to the cylinder case 4,
When the molten metal C is sucked into the cylinder case 4 while preventing the movement of the molten metal C between the facing surfaces, the molten metal C is sucked into between the facing surfaces and is sucked into the cylinder case 4. When the molten metal C is supplied to the casting apparatus B, the molten metal C is prevented from leaking through between the facing surfaces so that a predetermined amount of the molten metal C can be supplied to the casting apparatus B with high accuracy, and the cylinder The piston ring 8 scrapes off the sludge of the molten metal C adhered to or accumulated on the case 4 to prevent the situation where the piston ring 8 is seized on the cylinder case 4 through such sludge. .

[0004]

However, even when the above-mentioned piston ring (sealing ring) 8 cannot sufficiently scrape off the sludge of the molten metal C adhered to or accumulated on the cylinder case 4, There is a drawback that the cylinder case 4 is seized by the sludge and easily damaged at an early stage.

That is, when the seizure of the piston ring 8 on the cylinder case 4 is weak, even if the piston 5 is moved together with the piston ring 8 against the seizure force, the piston ring 8 is less likely to be damaged, but strongly. If the piston 5 is forcibly moved against the seizure force in the seizure state, the piston ring 8 is easily damaged.

Therefore, in order to prevent such damage and ensure durability, the thickness of the heat-resistant material along the radial direction of the ring and the width dimension along the axial direction of the ring are increased to ensure strength. However, in this case, the bending rigidity of the sealing ring in the radial direction becomes too large, the amount of elastic deformation in the radial direction becomes insufficient, the sealing performance cannot be ensured, and the sludge can be sufficiently scraped off. There is a risk that it will be burned out more easily because it disappears.

That is, the piston is originally provided so as to reciprocate concentrically with the axis Z of the cylinder case 4 (hereinafter referred to as the cylinder axis). Even if Y and the cylinder axis Z are deviated from each other, if the axes Y and Z are deviated in parallel to each other, the axis X of the piston ring 8 (hereinafter referred to as a ring axis) X is also Since it can be held parallel to the axes Y and Z, there is no risk of impairing the sealing property.

However, as shown in FIG. 5, an abnormal situation occurs in which the piston axis Y reciprocates in a state of being inclined with respect to the cylinder axis Z, that is, for one member (cylinder case) 4. If an abnormal situation occurs such that the pair of members 4 and 5 relatively move while the other member (piston) 5 is tilted, the clearance between the piston 5 and the cylinder case 4 increases, so With the piston ring 8 having a large bending rigidity and a small amount of elastic deformation in the radial direction, the sealing performance cannot be ensured, sludge cannot be sufficiently scraped off, and on the contrary, seizure may be likely to occur.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a sealing ring having a shape in which both durability and sealing performance are easily ensured.

[0010]

According to a first aspect of the present invention, there is provided a heat-resistant material having a quadrangular cross section, which is formed into a C-shaped ring that is cut at one position in the circumferential direction. Between the opposing surfaces of the pair of members that are relatively reciprocally movable in the direction, the peripheral surface is elastically deformed in the radial direction so as to be pressed against the one member by the elastic restoring force, and the other By mounting the pair of members in a state in which relative movement in the reciprocal movement direction is blocked, the peripheral surface slides with respect to one member in association with the relative reciprocal movement of the pair of members, A sealing ring configured to prevent the movement of molten metal through the through hole, wherein the thickness dimension of the heat resistant material along the radial direction of the ring is 0.02 times the outer diameter of the ring or more. The point is that the length is set to less than twice.

[Operation and Effect] If the thickness dimension of the heat resistant material along the ring radial direction is less than 0.02 times the ring outer diameter, the thickness dimension of the heat resistant material becomes too small, and the elastic deformation amount in the radial direction is reduced. Although it is large and easy to secure, if the strength is insufficient and the other member is forcibly moved against the seizure force, it will be easily damaged, and if the thickness exceeds 0.2 times the ring outer diameter, Although the thickness of the heat-resistant material becomes too large, sufficient strength is secured, and even if the other member is forcibly moved against the seizure force, it is less likely to be damaged, but the amount of elastic deformation in the radial direction is small. If an abnormal situation occurs in which the pair of members move relative to each other while the other member is inclined with respect to the other member, the sealability cannot be ensured and the sludge cannot be scraped sufficiently. On the contrary, it becomes easier to burn Are the dimensions, by setting 0.2 times the length of 0.02 times or more of the ring outside diameter, durability sealability together easily secured.

According to a second aspect of the present invention, the width dimension of the heat resistant material along the ring axis direction is set to be 0.2 times or more and 1.5 times or less the length dimension. There is a point.

[Operation and Effect] Among the sealing rings whose thickness dimension is set to be 0.02 times or more and 0.2 times or less of the outer diameter of the ring, along the ring axial direction of the heat resistant material. If the width dimension is less than 0.2 times the thickness dimension, seizure is likely to occur, and if the width dimension exceeds 1.5 times the thickness dimension, breakage is likely to occur. By setting the length to 5 times or less, it is difficult to cause seizure and damage.

A third aspect of the invention is characterized in that the heat resistant material is formed by sintering a silicon nitride material.

[Operation and effect] Compared to the case where the heat-resistant material is made of metal, the above-mentioned phenomenon such as "burn-in" or "galling" due to the formation of intermetallic compounds is less likely to occur, and durability and sealing property are further secured. easy.

According to a fourth aspect of the present invention, the heat resistant material is formed by sintering a composite material of a metal material and a ceramic material.

[Operation and effect] Compared to the case where the heat-resistant material is made of metal, the phenomenon such as the above-mentioned "burn-in" or "galling" due to the formation of the intermetallic compound occurs due to the sliding of the ceramic material portion with respect to one member. Difficult and
It is easy to secure strength due to the metal material part, and it is easier to secure durability and sealability.

According to a fifth aspect of the present invention, the heat-resistant material is formed into a trapezoidal cross-sectional shape having two sides parallel to each other along the ring axis, and the two parallel sides are parallel to each other. One of the long sides is fitted into a dovetail groove formed in the other member, and the peripheral surface of the shorter side of the two parallel sides is pressed against the one member. There is a point.

[Operation and Effect] The heat-resistant material is formed in a trapezoidal cross-sectional shape, and the long side of two parallel sides is fitted into the dovetail groove formed in the other member, and the short side Since the peripheral surface is configured to be in pressure contact with one member, even if the sealing ring may be broken, the entire sealing ring does not fall off from the other member, It is possible to prevent a sharp decrease in the sealing property, and also to collect the broken sealing ring together with the other member and easily take necessary measures such as replacement.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

[First Embodiment] FIG. 1 shows a hot water supply apparatus A for supplying a molten metal C, such as a magnesium alloy, an aluminum alloy, or a zinc alloy, to a casting apparatus B as an example of a molten metal, a molten metal pump 1, and a molten metal pump 1. The supply pipe 2 for supplying C to the casting apparatus B, the state in which the melt C in the melt furnace D can be sucked into the melt pump 1, and the state in which the melt C sucked into the melt pump 1 can be discharged into the supply pipe 2 A switching valve 3 for switching the passage is provided so that the molten metal C discharged from the molten metal pump 1 can be supplied to the mold B1 through the supply pipe 2 covered with the heat-resistant heat insulating material 2a. A sealing ring E according to the present invention is attached to a piston 5 of the molten metal pump 1 as a piston ring 8.

The molten metal pump 1 is integrally formed with a cylinder case 4 made of ceramic (silicon nitride), a piston 5 made of ceramic (silicon nitride) reciprocally movable up and down in the cylinder case 4, and a piston 5. A piston rod 6 for moving the piston rod 6 up and down, and a piston ring 8 made of ceramic (silicon nitride).
By moving the piston 5 upward so that the molten metal C in the molten metal furnace D can be sucked into the cylinder case 4 through the suction / discharge passage 9 and the piston 5 can be moved downward. The molten metal C in the cylinder case 4 can be discharged through the suction / discharge passage 9 by moving it.

As shown in FIGS. 2 and 3, in the cylinder case 4, the lower opening of the cylinder chamber forming through hole 11 formed in the case body 10 is closed by a cylinder plug 12 to form a cylinder chamber 13. Base plate 14 and case body 10 that are detachably fixed to the furnace lid D1 of the melting furnace D
The outer peripheral side of the connecting arm 1 made of ceramic (silicon nitride)
5, the cylinder case 4 is fixed so that the whole of the cylinder case 4 is submerged in the molten metal C at a position lower than the liquid level elevation range of the molten metal C in the molten metal furnace D, and the piston driving pneumatic cylinder 7 and the valve operating pneumatic cylinder are fixed. Support table 17 for supporting 16 and
Are fixed to the base plate 14 by columns 18.

As shown in FIG. 4, the piston ring 8 is a heat-resistant material 50 having a quadrangular cross section formed by sintering a silicon nitride material, and has a C-shape which is cut at one position in the circumferential direction. A cylinder case 4 and a piston 5, which are a pair of members that are formed in a ring shape and are elastically deformable in the radial direction, and that are relatively reciprocally movable in one direction, as shown in FIGS. 2 and 3. Between the inner peripheral surface of the cylinder case 4 and the outer peripheral surface of the piston 5, which are opposed surfaces that are opposed to each other in a direction orthogonal to the moving direction of the cylinder case (one member) 4, Direction of reciprocating movement with respect to the piston (the other member) 5 while being elastically deformed in the diameter reducing direction so as to be pressed by the elastic restoring force and fitted in the annular groove 5a formed on the outer peripheral portion of the piston 5. By mounting it with the relative movement to the Thus, as the piston 5 reciprocates, the circumferential surface is slid against the inner circumferential surface of the cylinder case 4 to prevent movement of the molten metal C between the facing surfaces.

The thickness T of the heat-resistant material 50 along the radial direction of the ring is 0.2 when the outer diameter K of the ring is 0.02 times or more.
By setting the length of the heat-resistant material 50 along the ring axis X direction, the width H of the heat-resistant material 50 is set to 0.2 times or more and 1.5 times or less of the thickness T by setting Even if the piston 5 is moved together with the piston ring 8 against the seizure force of the piston ring 8 with respect to the cylinder case 4, while ensuring sufficient strength and a sufficient amount of elastic deformation in the radial direction,
While making it difficult for the piston ring 8 to be damaged,
As shown in FIG. 5, when the piston axis Y is tilted with respect to the cylinder axis Z, the piston 5 moves toward the cylinder axis Z.
Even if an abnormal situation occurs such that the piston 5 reciprocates along the circumference, and the clearance between the outer peripheral surface of the piston 5 and the inner peripheral surface of the cylinder case 4 increases, the sealing performance can be ensured.
Sludge can be scraped off sufficiently.

As shown in FIGS. 2 and 3, the switching valve 3 has a spool type valve body 19 and its valve rod 20 integrally formed of ceramic (silicon nitride) and connected in a substantially concentric manner. At the same time, the case main body is provided with an insertion hole 21 into which the valve element 19 and the valve rod 20 are vertically movable so that the upper end of the insertion hole 21 is opened below the liquid level lower than the liquid level elevation range of the molten metal C in the molten metal furnace D. 1
0, and the valve body 19 is inserted into the insertion hole 21 together with the valve rod 20 so that the valve rod 20 projects upward from the upper end of the insertion hole 21.

The insertion hole 21 is a large diameter insertion hole 22 in the upper part.
The lower diameter insertion hole 23 and the lower small diameter insertion hole 23 are connected by a tapered hole portion 24 having a tapered inner diameter, and the lower end of the small diameter insertion hole 23 is closed by a valve plug 25. The hole is constituted by a small-diameter insertion hole 23, and a molten metal suction passage 26 communicating with the molten metal furnace D is formed laterally near the lower end of the valve body moving hole 23, and a molten metal discharge passage 27 communicating with the supply pipe 2 is formed. The suction and discharge passages 9 are vertically formed so as to open in the valve body moving holes 23, and a communication passage 28 that communicates the inside of the melt furnace D and the large-diameter insertion hole 22 is formed laterally.

Similar to the piston ring 8 shown in FIG. 4, the valve body 19 is formed in a C shape by dividing one portion in the circumferential direction and is elastically deformable in the radial direction (silicon nitride). A pair of upper and lower valve body portions 30, 3 provided with a seal ring 29 made of metal so as to be in sliding contact with the inner peripheral surface of the valve body moving hole 23.
1, the valve body 19 is moved up and down along the valve body moving hole 23 by the vertical movement operation of the valve rod 20 by the operation of the valve operating pneumatic cylinder 16, and as shown in FIG.
The lower valve body 31 to block the communication between the exhaust passage 27 and the intake / exhaust passage 9 (hereinafter referred to as the intake position), and the exhaust passage 27 is connected to the intake / exhaust passage 9, as shown in FIG. 9 so as to connect the discharge passage 27 and the large-diameter insertion hole 22 to each other so that the upper valve body portion 30 is blocked, and the suction passage 26 and the suction and discharge passage 9 are connected to each other.
The flow path of the molten metal C can be switched by changing the contact state with the inner surface of the valve body moving hole to a state in which communication with the lower valve body section 31 is blocked (hereinafter referred to as a discharge position). is there.

As shown in FIG. 2, the molten metal C in the molten metal furnace D is sucked into the cylinder chamber 13 by the upward movement operation of the piston 5 with the valve body 19 moved to the suction position. As shown in FIG. 3, the molten metal C in the cylinder chamber 13 is discharged to the supply pipe 2 by the downward movement operation of the piston 5 with the valve body 19 moved to the discharge position. is there.

The outer peripheral portion of the valve rod 20 closes the space between the valve rod 20 and the large-diameter insertion hole 22 and is substantially in relation to the inner peripheral surface of the large-diameter insertion hole as the valve rod 20 is moved up and down. A scraper 32 that slides over the entire circumference is provided so as to move near the upper end of the large-diameter insertion hole 22 in a state where the valve body 19 moves to the upper end of the vertical movement range.

Similar to the piston ring 8 shown in FIG. 4, the scraper 32 is formed in a C shape by dividing one portion in the circumferential direction and is made of ceramic (silicon nitride) which is elastically deformable in the radial direction. As shown in FIG. 6, the ring member 33 of No. 3 is attached to the annular groove 20a formed on the outer peripheral portion of the valve rod 20 in a retaining state to prevent metal oxides such as metal oxides generated near the melt surface of the melt furnace D. The sludge is prevented from entering the vicinity of the valve body 19, and even if the sludge adheres or accumulates on the inner peripheral surface of the large-diameter insertion hole, the ring member 3 associated with the operation of the valve body 19
By the sliding movement in the vertical direction with respect to the inner peripheral surface of the large diameter insertion hole of 3,
The sludge can be scraped off.

The seal ring 29 and the ring member 33.
Are valve bodies 30, 3 in a state of being elastically deformed in the diameter reducing direction.
1 and the valve rod 20 and are brought into pressure contact with the inner peripheral surfaces of the valve body moving hole 23 and the large diameter insertion hole 22 by its elastic restoring force.

The piston ring 8 and the seal ring 2
As shown in FIG. 4, the ring member 33 has an angle cut abutment shape in which the end face 41 at the dividing position is formed obliquely along the circumferential direction.
Since they are provided so as to be able to move relative to each other along the circumferential direction in a state where they face each other in the sliding direction, it is possible to effectively prevent the molten metal C from moving through the divided portions.

In the above embodiment, the cylinder case 4, the piston 5, the piston rod 6, the piston ring 8, the connecting arm 15, the valve body 19, the valve rod 20, the seal ring 29, and the ring member 33 are made of silicon nitride. However, when molten metal C is a magnesium alloy molten metal, SKD
A steel-based material such as, for example, may be used, and a surface treatment such as Almer processing may be appropriately performed.

[Second Embodiment] Although not shown, a metal material such as titanium (Ti) and titanium carbide are used instead of the piston ring 8 formed of the heat-resistant material 50 made of silicon nitride shown in the first embodiment. Piston ring 8 formed of heat-resistant material 50 obtained by sintering a composite material with a ceramic material such as (TiC)
May be provided. Other configurations are similar to those of the first embodiment.

[Third Embodiment] FIG. 7 shows another embodiment of the piston ring 8 as the sealing ring E, in which the cross-sectional shape of the heat-resistant material 50 is two parallel to each other along the ring axis X direction. It is formed in a trapezoidal shape with sides 50a and 50b, and as shown in FIG.
The long side 50b side of b is the piston (the other member) 5
It fits into the dovetail groove portion 5b formed in an annular shape on the outer peripheral portion of the cylinder so that the peripheral surface on the short side 50a side of the two parallel sides 50a, 50b is pressed against the cylinder case (one member) 4. Is configured. Other configurations are similar to those of the first or second embodiment.

[Fourth Embodiment] FIG. 8 shows another example of the molten metal pump 1, in which the cylinder case 4 has a lower opening 51 opened to the molten metal C of the molten metal furnace D (silicon nitride).
A cylindrical case body 10 made of ceramics and a circular case top plate 52 made of ceramics (silicon nitride) that closes the upper opening of the case body 10 are provided, and the piston is the same as that shown in the first embodiment. A cylinder chamber 13 is formed in a case body 10 between a ceramic (silicon nitride) piston 5 provided with a ring 8 and a case top plate 52, and an intake / exhaust passage 9 communicating with the cylinder chamber 13 is formed. .

A cylindrical spacer 53 is integrally formed on the upper end of the case body 10, the cylindrical spacer 53 is fixed to the furnace lid D1 of the melting furnace D, and the entire cylinder case 4 is melted in the melting furnace D. It is fixed so as to sink into the molten metal C at a position lower than the lowest minimum liquid level L in the liquid level elevation range of C.

A ceramic (silicon nitride) cylindrical member 54 for pressing the case top plate 52 against the case body 10 from above is fixed to the upper part of the cylindrical spacer 53, and a bearing for supporting the piston rod 6 so as to be vertically movable. A ceramic (silicon nitride) bearing member 56 provided with a cylinder portion 55 is fixed so as to close the inside of the cylindrical member 54.
The piston rod 6 is vertically reciprocally inserted through the bearing cylinder 55 and the through hole 57 formed in the case top plate 52, and the piston 8 is reciprocally moved by the vertical reciprocating operation. Then, the molten metal C sucked into the cylinder chamber 13 through the suction / discharge passage 9 is discharged to the supply pipe 2 through the suction / discharge passage 9 and can be supplied to the casting apparatus B.

The sealing ring E according to the present invention
As shown in FIG. 9, the peripheral surface is provided between the opposed surfaces of the piston rod 6 and the case top plate 52, which are a pair of members provided so as to be relatively reciprocally movable in one direction, in the direction orthogonal to the moving direction. Is elastically deformed in the radial direction so as to be pressed against the piston rod (one member) 6 with an elastic restoring force, and is relatively moved in the reciprocating direction with respect to the case top plate (the other member) 52. So that the piston rod 6 can be mounted in a state in which the piston rod 6 is reciprocally moved relative to the case top plate 52, the peripheral surface of the through hole 57 is fitted to the annular groove 58 formed in the inner peripheral portion of the through hole 57. And slide it to prevent movement of the molten metal C between the facing surfaces, and when sucking the molten metal C into the cylinder chamber 13, sucking the molten metal C between the facing surfaces and into the cylinder chamber 13. Supply the inhaled molten metal C to the casting device B It is possible to prevent the molten metal C from leaking out between the facing surfaces when it is heated, and scrape off the sludge of the molten metal C adhered to or deposited on the circumferential surface of the piston rod 6 with the sealing ring E, It is possible to prevent a situation in which the sealing ring E is seized on the piston rod 6 through such sludge.
Other configurations are the same as those in the first to third embodiments.

[Other Embodiments] 1. The sealing ring according to the present invention is a ring mounted on the outer peripheral portion of the valve rod 20 to form the seal ring 29 provided on the valve body portions 30 and 31 of the valve body 19 shown in the first embodiment and the scraper 32. It may be used as the member 33. 2. The sealing ring according to the present invention may have a step cut or scare cut abutment shape.

[0042]

EXAMPLES Sealing rings of various sizes having different combinations of the ring outer diameter K of the sealing ring E, the thickness dimension T of the heat resistant material 50 along the ring radial direction, and the width dimension H along the ring axis direction ( (Hereinafter referred to as Samples 1 to 13), and the piston 5 of the molten metal pump 1 shown in the first embodiment is manufactured.
Mounted on the
The operating time until 16 was damaged or seized and stuck to the cylinder case 4 was investigated.

[Table 1] shows the results of the investigation. Samples 8 and 9 in which the ratio (T / K) of the thickness dimension T to the ring outer diameter K is less than 0.02 were damaged in an operating time of about 1 month. However, the ratio (T / K) of the thickness dimension T to the ring outer diameter K is 0.2.
In the sample 11 exceeding the above range, the piston rod 6 was deformed in about 1 month of operation time, and seized and stuck to the cylinder case 4.

Sample 1 in which the ratio (T / K) of the thickness dimension T to the ring outer diameter K is 0.02 or more and 0.2 or less.
~ 7, among Sample 10 and Samples 12 and 13,
The sample 10 and the sample 12 having a ratio (H / T) of the width dimension H to the thickness dimension T of less than 0.2 were seized and adhered to the cylinder case 4 in an operating time of about 1 month.
The sample 13 having a ratio (H / T) of the width dimension H to the thickness dimension T of more than 1.5 was broken in an operating time of about 1 month, and the ratio of the thickness dimension T to the ring outer diameter K (T / K). Is 0.0
Samples 1 to 7 in which the ratio (H / T) of the width dimension H to the thickness dimension T is 0.2 or more and 1.5 or less, even if it is 2 or more and 0.2 or less, are damaged even when the operating time is 6 months or more. Good results are shown without sticking, and it can be seen that it is easy to secure both durability and sealability.

The material SN indicates a ceramic obtained by sintering silicon nitride having a hardness of 90 HRA and a density of 3.2, and the material MC indicates titanium (Ti) and titanium carbide (Ti).
It shows a metal ceramic obtained by sintering a composite material with C).

[Table 1]

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a molten metal water heater.

FIG. 2 is a partial cross-sectional side view of a main part.

FIG. 3 is a partial cross-sectional side view of a main part.

FIG. 4 is a perspective view of a sealing ring.

FIG. 5 is an enlarged view of the main part.

FIG. 6 is a sectional view of the main part

7A is a perspective view of a sealing ring of the third embodiment, and FIG. 7B is a cross-sectional view of a main part.

FIG. 8 is a partial sectional side view showing another example of the molten metal pump.

FIG. 9 is a cross-sectional view of the main part

[Explanation of symbols]

4 One member (cylinder case) 5 Other member (piston) 5b dovetail 50 heat resistant material 50a short side 50b long side C molten metal H width dimension K ring outer diameter T Thickness dimension

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jiro Tsuchida             2-47 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka               Kubota Corporation (72) Inventor Hiroshi Yamaguchi             2-47 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka               Kubota Corporation F term (reference) 3J044 AA08 BA09 BC07 CB01 CB04                       CB24 DA20                 4E014 LA18

Claims (5)

[Claims] 1. A pair of members, which are made of a heat-resistant material having a quadrangular cross section and are formed into a C-shaped ring that is divided at one position in the circumferential direction so as to be relatively reciprocally movable in one direction. Between the surfaces in a state where the peripheral surface is elastically deformed in a radial direction so as to be pressed against one member by an elastic restoring force, and a relative movement in the reciprocating direction with respect to the other member is prevented. By mounting, the peripheral surface is slid relative to one member in association with the relative reciprocating movement of the pair of members, and the movement of the molten metal through the facing surfaces can be prevented. A certain sealing ring, wherein the thickness dimension of the heat resistant material along the ring radial direction is set to 0.02 times or more and 0.2 times or less of the ring outer diameter. 2. The seal according to claim 1, wherein the width dimension of the heat resistant material along the ring axis direction is set to be 0.2 times or more and 1.5 times or less of the thickness dimension. ring. 3. The seal ring according to claim 1, wherein the heat resistant material is formed by sintering a silicon nitride material. 4. The sealing ring according to claim 1, wherein the heat resistant material is formed by sintering a composite material of a metal material and a ceramic material. 5. The cross-sectional shape of the heat-resistant material is formed into a trapezoid having two sides parallel to each other along a ring axis direction, and the longer side of the two sides parallel to each other is the other side. 5. A dovetail groove formed in the member of claim 1 is fitted so that the peripheral surface on the shorter side of the two parallel sides is pressed against the one member. The ring for sealing according to any one of claims.