WO2013146719A1

WO2013146719A1 - Pump

Info

Publication number: WO2013146719A1
Application number: PCT/JP2013/058655
Authority: WO
Inventors: 太輔中野; 真野口; 弘樹細見
Original assignee: 株式会社クボタ
Priority date: 2012-03-29
Filing date: 2013-03-26
Publication date: 2013-10-03
Also published as: CN104169585B; JP5979935B2; JP2013204530A; CN104169585A

Abstract

A space between bonded surfaces (18, 20) bonded to each other is sealed by first and second seal members (23, 28), and one end portion (33a) of the second seal member (28) abuts a side surface of the first seal member (23). The second seal member (28) separates a low pressure portion from a high pressure portion in a casing, is fitted in a second seal groove (29), and has a deformation portion (31) and a restriction portion (32). In a state where each casing body is separated, the deformation portion (31) protrudes from the second seal groove (29) onto the bonded surface (20), and is easily compress-deformed in a height direction. In a state where each casing body is separated, the restriction portion (32) is in contact with an inner surface of the second seal groove (29) and is rarely expansion-deformed in a lateral direction and a bottom direction of the second seal groove (29).

Description

pump

The present invention relates to a pump having a casing in which a plurality of casing bodies are joined via joining surfaces.

Conventionally, as this type of pump, for example, as shown in FIG. 15, a casing in which a lower casing body 101 and an upper casing body are joined via a joining surface 102, a suction side chamber 103 formed in the casing, and Some have a discharge side chamber 104.

The space between the joint surface 102 of the lower casing body 101 and the joint surface of the upper casing body is sealed by a first seal member 105 that prevents water leakage from the inside of the casing to the outside. The first seal member 105 is made of string-like rubber, is fitted into a first seal groove 106 formed on the joint surface 102 of the lower casing body 101, and is provided along the peripheral edge of the lower casing body 101. ing.

Furthermore, the joint surface 102 of the lower casing body 101 and the joint surface of the upper casing body are sealed by a second seal member 107 that separates the suction side chamber 103 and the discharge side chamber 104. The second seal member 107 is made of string-like rubber, and is fitted into a second seal groove 108 formed on the joint surface 102 of the lower casing body 101.

According to this, since the lower casing body 101 and the upper casing body are joined to assemble the casing, and the pump is driven, the water flowing in the casing is sealed by the first seal member 105. Can be prevented from leaking from the joint surface 102 to the outside of the casing. Further, the second seal member 107 seals between the suction side chamber 103 through which low-pressure water flows and the discharge side chamber 104 through which high-pressure water flows.

Note that the above pump is described in, for example, Japanese Patent Publication No.

JP 2010-196665 A

However, in the above conventional type, the gap 109 is formed between the end of the second seal member 107 and the first seal member 105, so that the seal between the suction side chamber 103 and the discharge side chamber 104 is not sealed. There is a risk that high pressure water will leak from the discharge side chamber 104 through the gap 109 and leak into the low pressure suction side chamber 103.

It is an object of the present invention to provide a pump that can prevent fluid in the high-pressure part from leaking from between the end of the second seal member and the first seal member into the low-pressure part.

In order to achieve the above object, the first invention has a casing in which a plurality of casing bodies are joined via joining surfaces, and a low pressure part and a high pressure part formed in the casing,
A space between the joint surfaces joined to each other is sealed by a first seal member that prevents fluid from leaking from the inside of the casing to the outside,
The first seal member is a pump made of a string-like elastic material, and fitted in a first seal groove formed on the joint surface of any casing body,
The joint surfaces to be joined together are sealed by a second sealing member that separates the low pressure part and the high pressure part,
The second seal member is made of a string-like elastic material and is fitted in the second seal groove,
The second seal groove is formed on the joint surface of the casing body having the first seal groove,
In the casing, one end in the longitudinal direction of the second seal member is abutted against the side surface between both ends of the first seal member,
The second seal member has a deformation portion and a restraint portion,
The deformed portion of the second seal member protrudes from the second seal groove onto the joint surface in a state where each casing body is separated, and is easily compressed and deformed in the height direction.
The restraint portion of the second seal member is in contact with the inner surface of the second seal groove in a state where the casing bodies are separated, and it is difficult to expand and deform the second seal groove in the lateral direction and the bottom direction. Is.

According to this, one end of the second seal member is fitted by fitting the first seal member into the first seal groove, fitting the second seal member into the second seal groove, and joining the plurality of casing bodies. Is abutted against the side surface of the first seal member, so that the gap between one end of the second seal member and the first seal member is sealed without a gap. Thereby, it can prevent that the fluid in a high voltage | pressure part leaks into the low voltage | pressure part from between the one end part of a 2nd seal member, and a 1st seal member.

By joining a plurality of casing bodies, the deformed portion of the second seal member is easily pressed and deformed in the height direction by being pressed against the joint surface of the casing body, but the restraining portion of the second seal member is It becomes difficult to enlarge and deform the second seal groove in the lateral direction and the bottom direction. For this reason, the compressed second seal member loses the escape field and extends in the longitudinal direction, and one end of the second seal member is firmly pressed against the side surface of the first seal member. Thereby, between the one end part of the 2nd seal member and the 1st seal member can be sealed reliably.

In the pump according to the second invention, one end of the second seal groove communicates with the first seal groove,
The groove depth of the second seal groove is formed shallower at the other end.

According to this, when a plurality of casing bodies are joined, the compression rate of the second seal member increases as the other end portion where the groove depth of the second seal groove becomes shallower. For this reason, the second seal member is pushed from the other end side to the one end side, and the elongation of the one end portion in the longitudinal direction of the second seal member is larger than the elongation of the other end portion. Thereby, the one end part of the 2nd seal member is pressed more firmly on the side of the 1st seal member.

In the pump according to the third aspect of the present invention, the groove depth of the second seal groove is formed so that at least a part between both end portions is shallow.

According to this, when a plurality of casing bodies are joined, the compression rate of the second seal member increases as the shallow portion formed at least between the both ends of the second seal groove. For this reason, the second seal member is pushed from the shallow portion of the second seal groove toward both ends, and the elongation of both ends in the length direction of the second seal member increases. Thereby, the one end part of the 2nd seal member is pressed more firmly on the side of the 1st seal member.

In the pump according to the fourth aspect of the present invention, the cross section of the restraining portion of the second seal member has the same shape as the cross section of the bottom portion of the second seal groove.

According to this, when a plurality of casing bodies are joined, the restraining portion of the second seal member contacts all the inner surfaces of the second seal groove. For this reason, it is suppressed and it becomes difficult for the restraint part of a 2nd seal member to carry out expansion deformation in the transversal direction and bottom direction of a 2nd seal groove. Therefore, the compressed second seal member loses the escape field in the cross-sectional direction and reliably extends in the longitudinal direction.

In the pump according to the fifth aspect of the invention, the cross section of the restraining portion of the second seal member is a square shape,
The cross section of the deformed portion of the second seal member has an arc shape.

In the pump according to the sixth aspect of the present invention, the abutting surface formed at one end of the second seal member has the same shape as the side surface of the first seal member.

According to this, when a plurality of casing bodies are joined, the abutting surface of the one end portion of the second seal member is pressed against the side surface of the first seal member over the entire surface, so one end of the second seal member The portion and the first seal member are more reliably sealed.

In the pump according to the seventh aspect of the invention, the filling rate of the second seal member with respect to the second seal groove is in the range of 100 to 140% in a state where the plurality of casing bodies are separated.

According to this, when a plurality of casing bodies are joined, the compressed second seal member surely loses the escape place in the short direction, and thus reliably extends in the longitudinal direction.

In the pump according to the eighth aspect of the invention, an accessory is provided between the low pressure portion and the high pressure portion in the casing.
The other end of the second seal member is abutted against the accessory part.

According to this, when a plurality of casing bodies are joined, the compressed second seal member loses the escape field and extends in the longitudinal direction, and the other end of the second seal member is firmly pressed against the accessory part. Thereby, it can seal reliably between the other end part of a 2nd sealing member, and an accessory.

In the pump according to the ninth aspect of the invention, the cross section of the first seal member has the same shape as the cross section of the second seal member.

As described above, according to the present invention, the gap between the one end portion of the second seal member and the first seal member can be reliably sealed, and the fluid in the high-pressure portion can be separated from the one end portion of the second seal member. It is possible to prevent leakage into the low pressure portion from between the sealing member and the one sealing member. This improves the efficiency of the pump.

It is a side view of the pump in the 1st embodiment of the present invention. It is the figure which divided | segmented the casing of the pump same as the above. It is a top view of the lower casing body of a pump same as the above. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing of the 1st and 2nd sealing member when a casing body of a pump is divided | segmented similarly, a 1st sealing member shows a cross section, and a 2nd sealing member shows a longitudinal cross section. It is sectional drawing of the 1st and 2nd sealing member when a casing body of a pump is joined, the 1st sealing member shows a transverse section, and the 2nd sealing member shows a longitudinal section. FIG. 4 is a cross-sectional view of the second seal member and the second seal groove of the pump, in which (a) shows a state in which the second seal member is removed from the second seal groove, and (b) shows the second seal member. A state of being fitted in the second seal groove, (c) shows a state in which the second seal member is compressed in the second seal groove. It is a figure of the one end part of the 2nd sealing member of a pump same as the above. It is a longitudinal cross-sectional view of the 2nd seal groove of the pump in the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the 2nd seal groove of the pump in the 3rd Embodiment of this invention. It is a figure of the one end part of the 2nd sealing member of the pump in the 4th Embodiment of this invention. It is a figure of the one end part of the 2nd sealing member of the pump in the 5th Embodiment of this invention. It is an enlarged plan view of the shaft seal part of the lower casing body of the pump in the 6th Embodiment of this invention. It is a cross-sectional view of the second seal member and the second seal groove of the pump in the seventh embodiment of the present invention. It is a top view of the lower casing body of the conventional pump.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, in the first embodiment, as shown in FIGS. 1 to 3, reference numeral 1 denotes a double suction centrifugal pump, and a suction port 3 and a discharge port 4 are formed in the casing 2. In the casing 2, a discharge side chamber 5 (an example of a high pressure part) communicating with the discharge port 4 and a suction side chamber 6 (an example of a low pressure part) located on both sides of the discharge side chamber 5 and communicating with the suction port 3 are formed. Has been. A main shaft 8 and an impeller 9 provided on the main shaft 8 are provided in the casing 2.

The impeller 9 is stored in the discharge side chamber 5. A wear ring 10 (an example of an accessory part) is fitted into the casing 2 between the discharge side chamber 5 and the suction side chamber 6. The wear ring 10 surrounds the impeller 9 with a predetermined gap.

The casing 2 is composed of an upper casing body 14 and a lower casing body 15 that are divided into two vertically (divided into a plurality of parts) on a horizontal plane including the axis 11 of the main shaft 8. The upper casing body 14 has an upper flange 17 and an upper joint surface 18 at the lower end. The lower casing body 15 has a lower flange 19 and a lower joint surface 20 at the upper end. The upper casing body 14 and the lower casing body 15 are connected by a plurality of bolts 21 by joining the upper joint surface 18 and the lower joint surface 20. At this time, the upper joint surface 18 and the lower joint surface 20 are in surface contact with each other, and between the

joint surfaces

18 and 20, leakage of water (an example of fluid) from the inside of the casing 2 to the outside is prevented. Sealed by two (a plurality of) first seal members 23.

These first seal members 23 are made of string-like rubber (an example of an elastic material), and are fitted into a first seal groove 24 formed on the lower joint surface 20 of the lower casing body 15, so that the lower casing body 15. It is provided along the peripheral part. One end of the first seal member 23 reaches one shaft penetration part 25 of the lower casing body 15, and the other end reaches the other shaft penetration part 26.

Furthermore, the upper joint surface 18 and the lower joint surface 20 are sealed by a plurality of second seal members 28 that separate the discharge side chamber 5 and the suction side chamber 6. The second seal member 28 is made of string-like rubber (an example of an elastic material), and is fitted in a second seal groove 29 formed on the lower joint surface 20 of the lower casing body 15.

As shown in FIGS. 3 to 8, in the casing 2, one end portion of the second seal member 28 in the longitudinal direction A is abutted against the side surface between both end portions of the first seal member 23, and the second seal member The other end of the member 28 in the longitudinal direction A is abutted against the outer peripheral surface of the wear ring 10.

One end of the second seal groove 29 communicates with the first seal groove 24, and the other end of the second seal groove 29 communicates with the fitting portion of the wear ring 10. The second seal groove 29 has a pair of side surfaces 29a (an example of an inner surface) and a bottom surface 29b (an example of an inner surface) facing each other in the short direction B, and is a groove having a quadrangular cross section. The short direction B is a direction orthogonal to the long direction A, and corresponds to the width direction of the groove.

As shown in FIG. 7B, the second seal member 28 has a deformed portion 31 and a restrained portion 32. The deforming portion 31 is a portion that protrudes from the second seal groove 29 onto the lower joint surface 20 and is easily compressed and deformed in the height direction H in a state where the upper casing body 14 and the lower casing body 15 are separated. In addition, the restraining portion 32 is in contact with both side surfaces 29a and the bottom surface 29b of the second seal groove 29 in a state where the upper and

lower casing bodies

14 and 15 are separated, and the short direction B of the second seal groove 29 and This is a portion where expansion deformation in the bottom direction C is difficult. The cross section of the restraining portion 32 is a quadrangular shape, and includes the bottom (that is, the side surface 29a and the bottom surface 29b) of the second seal groove 29 except for the height (that is, the groove depth) of the second seal groove 29. (Region) has the same shape as the cross section. Moreover, the cross section of the deformation | transformation part 31 is circular arc shape. The transverse section is a section orthogonal to the longitudinal direction A, and the longitudinal section is a section parallel to the longitudinal direction A. As shown in FIGS. 5 and 8, both end surfaces 33 a and 33 b of the second seal member 28 are formed perpendicular to the bottom surface 34 of the second seal member 28.

In a state where the upper casing body 14 and the lower casing body 15 are separated, the filling rate of the second seal member 28 into the second seal groove 29 is in the range of 100 to 140%. The filling rate is defined by the following formula.

Filling ratio = crossing area of second seal member 28 / crossing area of second seal groove 29 Further, as shown in FIG. 5, the cross section of first seal member 23 is the cross section of second seal member 28. The cross section of the first seal groove 24 has the same shape and the same size as the cross section of the second seal groove 29.

Hereinafter, the operation of the above configuration will be described.

As shown in FIG. 5, the first seal member 23 is fitted in the first seal groove 24, the second seal member 28 is fitted in the second seal groove 29, and as shown in FIG. 18 and 20 are joined, and the upper and

lower casing bodies

14 and 15 are connected with bolts 21 to assemble the casing 2. As a result, as shown in FIG. 6, the second seal member 28 extends in the longitudinal direction A, and the one end surface 33 a is abutted against the side surface of the first seal member 23. For this reason, the gap between the one end surface 33a of the second seal member 28 and the first seal member 23 is sealed without any gap, and the water in the discharge side chamber 5 is in contact with the one end surface 33a of the second seal member 28 and the first seal member 28. It is possible to prevent leakage from between the sealing member 23 and the suction side chamber 6.

Similarly, the other end surface 33b of the second seal member 28 is abutted against the outer peripheral surface of the wear ring 10, so that the gap between the other end surface 33b of the second seal member 28 and the wear ring 10 is sealed without any gaps. The water in the side chamber 5 can be prevented from leaking into the suction side chamber 6 from between the other end surface 33b of the second seal member 28 and the wear ring 10. By preventing such water leakage, the efficiency of the pump 1 is improved.

At this time, as shown in FIG. 7C, the deformed portion 31 of the second seal member 28 is pressed by the upper joint surface 18 of the upper casing body 14 and is easily compressed and deformed in the height direction H. On the other hand, the restraining portion 32 of the second seal member 28 is in surface contact with all the inner surfaces of the second seal groove 29, that is, both side surfaces 29a and the bottom surface 29b. The expansion deformation in the direction B and the bottom direction C becomes difficult, and the deformation in the short direction B and the bottom direction C hardly occurs. Accordingly, the compressed second seal member 28 loses the escape field in the cross-sectional direction and reliably extends in the longitudinal direction A, and as shown in FIGS. 4 and 6, one end surface 33a of the second seal member 28. Is firmly pressed against the side surface of the first seal member 23, and the other end surface 33 b of the second seal member 28 is firmly pressed against the outer peripheral surface of the wear ring 10. Thereby, the space between the one end surface 33a of the second seal member 28 and the first seal member 23 and the space between the other end surface 33b of the second seal member 28 and the wear ring 10 can be surely sealed.

Further, since the filling rate of the second seal member 28 with respect to the second seal groove 29 is in the range of 100 to 140%, the second seal compressed when the upper and lower joining

surfaces

18 and 20 are joined together. The member 28 surely loses its escape in the cross-sectional direction and extends in the longitudinal direction A. Thereby, the sealing function as described above is improved.

Moreover, as shown in FIG. 6, since the inner side and the outer side of the pump 1 are sealed by the first sealing member 23 between the upper and lower

joint surfaces

18 and 20, the water in the casing 2 is sealed to the both

joint surfaces

18 and 20. It is possible to prevent leakage to the outside of the casing 2 from between.

(Second Embodiment)
Next, in the second embodiment, as shown in FIG. 9, the groove depth D of the second seal groove 29 becomes shallower as it approaches the other end E (that is, the end on the wear ring 10 side). Is formed.

According to this, when the upper and

lower casing bodies

14 and 15 are joined, the second seal member 28 is compressed in the height direction H. At this time, if the height of the second seal member 28 in the non-compressed state is h1 and the height in the compressed state is h2 at an arbitrary position in the longitudinal direction A, the second seal member 28 at that position. The compression ratio is defined by the following equation.
Compression rate = (h1-h2) / h1
Since the compression rate of the second seal member 28 increases toward the other end E where the groove depth D of the second seal groove 29 becomes shallower, the second seal member 28 moves from the other end E side to the one end F side. (Ie, the first seal member 23 side), the extension of the one end F in the longitudinal direction A of the second seal member 28 is larger than the extension of the other end E. Thereby, the one end surface 33a of the second seal member 28 is pressed more firmly against the side surface of the first seal member 23, and the seal function is greatly improved.

In the second embodiment, only the other end E of the second seal groove 29 is partially shallow, but it may be gradually made shallower over the entire length from the one end F to the other end E.

(Third embodiment)
Next, in the third embodiment, as shown in FIG. 10, a shallow groove portion 35 having a shallow groove depth D is formed in a part between both end portions E and F of the second seal groove 29. . The second seal groove 29 is gradually formed deeper from the shallow groove portion 35 toward both end portions E and F.

According to this, when the upper and

lower casing bodies

14 and 15 are joined, the compressibility of the second seal member 28 increases as the shallow groove portion 35 where the groove depth D of the second seal groove 29 becomes shallower. For this reason, the second seal member 28 is pushed from the shallow groove portion 35 to both ends E and F (that is, the first seal member 23 side and the wear ring 10 side), and both end portions E and F of the second seal member 28 are pressed. The elongation of F increases. As a result, the one end surface 33a of the second seal member 28 is pressed firmly against the side surface of the first seal member 23, and the other end surface 33b of the second seal member 28 is pressed firmly against the wear ring 10. The sealing function is greatly improved.

In the third embodiment, the shallow groove portion 35 having a shallow groove depth D is formed at one place in the intermediate portion between the two end portions E and F of the second seal groove 29. The shallow groove portion 35 may be formed at any location between both end portions E and F. Moreover, you may form the shallow groove part 35 in the multiple places between both ends E and F. FIG. Alternatively, the second seal is gradually deepened from the shallow groove portion 35 toward both ends E and F, and the region extending from the portion reaching a certain depth to both ends E and F is maintained at a certain depth. The groove 29 may be used.

(Fourth embodiment)
In the first embodiment, as shown in FIG. 8, one end surface 33 a (an example of an abutting surface) of the second seal member 28 is formed perpendicular to the bottom surface 34. In this embodiment, as shown in FIG. 11, the one end surface 33 a of the second seal member 28 is inclined at an obtuse angle with respect to the bottom surface 34.

According to this, as shown in FIG. 11, the shape of the one end surface 33 a of the second seal member 28 viewed from the short direction B approximates the shape of the side surface of the first seal member 23 viewed from the longitudinal direction A. . For this reason, when the upper and

lower casing bodies

14 and 15 are joined together, the one end surface 33a of the second seal member 28 is pressed against the side surface of the first seal member 23 over the entire surface, whereby the second seal member 28 is pressed. The gap between the one end surface 33a of the member 28 and the first seal member 23 is more reliably sealed.

(Fifth embodiment)
In the fifth embodiment, as shown in FIG. 12, one end surface 33 a of the second seal member 28 is formed in the same shape as the side surface of the first seal member 23. That is, the shape of the one end face 33a of the second seal member 28 viewed from the short direction B is such that the lower part is formed perpendicular to the bottom face 34 and the upper part protrudes in an arc shape.

According to this, when the upper and

lower casing bodies

14 and 15 are joined together, the one end surface 33a of the second seal member 28 is surely brought into contact with and pressed against the side surface of the first seal member 23 over the entire surface. As a result, the gap between the one end surface 33a of the second seal member 28 and the first seal member 23 is more reliably sealed.

(Sixth embodiment)
In each of the above embodiments, the discharge side chamber 5 is given as an example of the high-pressure section, and the wear ring 10 is given as an example of the accessory part. However, the present invention is not limited to these, and for example, the sixth embodiment shown below. In this embodiment, a sealing water passage is provided as another example of the high-pressure portion, and a sealing ring is provided as another example of the accessory.

As shown in FIG. 13, shaft sealing portions 41 for sealing the space between the main shaft 8 and the

casing bodies

14 and 15 are provided in the

shaft penetrating portions

25 and 26 of the upper and

lower casing bodies

14 and 15, respectively. The shaft sealing portion 41 includes a plurality of annular gland packings 42 that seal between the inner peripheral surfaces of the

shaft penetrating portions

25 and 26 and the outer peripheral surface of the main shaft 8, and an annular sealing ring 43 (an example of an accessory part). ).

The casing 2 is provided with a sealed passage 44 for supplying water in the discharge side chamber 5 to the shaft sealing portion 41 as shaft sealing water W and sealing the shaft sealing portion 41. The sealed water passage 44 has a first supply passage 45 formed in the lower joint surface 20 of the lower casing body 15 and a second supply passage 46 (see a virtual line) formed in the upper casing body 14. ing.

The first supply passage 45 is a groove having an open upper surface when the upper casing body 14 and the lower casing body 15 are separated from each other, and the first supply passage 45 is a casing when the upper casing body 14 and the lower casing body 15 are joined together. 2 is a passage provided inside. One end of the first supply passage 45 communicates with the second supply passage 46, and the other end of the first supply passage 45 communicates with the outer circumferential groove 43 a of the sealing ring 43. The second supply passage 46 communicates with the discharge side chamber 5.

The first supply passage 45 is an example of a high-pressure section, and communicates with the discharge side chamber 5 through the second supply passage 46. Water in the discharge side chamber 5 having a pressure higher than that of the water in the suction side chamber 6 is supplied to the first supply passage 45 as the shaft seal water W toward the seal ring 43.

As shown by a solid line in FIG. 13, a second seal groove 29 is formed in the lower joint surface 20. The second seal member 28 is fitted in the second seal groove 29, and is interposed between the first supply passage 45 and the suction side chamber 6 so as to separate the first supply passage 45 and the suction side chamber 6. Is provided. One end portion in the longitudinal direction A of the second seal member 28 is abutted against the side surface between both end portions of the first seal member 23, and the other end portion in the longitudinal direction A of the second seal member 28 is the sealing ring 43. It is abutted against the outer peripheral surface of.

One end of the second seal groove 29 communicates with the first seal groove 24, and the other end of the second seal groove 29 communicates with the

shaft penetrating portions

25 and 26.

Hereinafter, the operation of the above configuration will be described.

By assembling the casing 2 by connecting the upper and

lower casing bodies

14 and 15, one end surface 33 a of the second seal member 28 is abutted against the side surface of the first seal member 23, and the second seal member 28 The other end surface 33 b is abutted against the outer peripheral surface of the sealing ring 43, and the suction side chamber 6 and the first supply passage 45 are separated from each other by the second seal member 28.

When the pump 1 is in operation, a part of the water in the discharge side chamber 5 passes through the sealed water passage 44, that is, the first and

second supply passages

45, 46 as the shaft sealed water W to the sealed water ring 43. As a result, the shaft seal 41 is sealed with water. At this time, the second sealing member 28 can prevent the shaft seal water W in the first supply passage 45 from leaking into the suction side chamber 6.

In the sixth embodiment, as shown by the solid line in FIG. 13, the second seal member 28 and the second seal groove 29 are provided between the first supply passage 45 and the suction side chamber 6. However, as shown by the phantom line in FIG. 13, the second seal member 28 and the second seal groove 29 are provided between the first supply passage 45 and the outer end surfaces of the

shaft penetrating portions

25 and 26. May be provided.

In each of the above embodiments, as shown in FIG. 7, the second seal groove 29 has a quadrangular cross section, and the second seal member 28 has a quadrangular lower portion and an arcuate upper portion. However, it is not limited to these cross-sectional shapes. For example, as a seventh embodiment, as shown in FIG. 14, the cross section of the second seal groove 29 may be U-shaped, and the cross section of the second seal member 28 may be circular. The same applies to the cross-sectional shape of the first seal groove 24 and the cross-sectional shape of the first seal member 23.

In each of the above embodiments, the groove depth D of the second seal groove 29 is the same as the groove depth D of the first seal groove 24. However, the groove depth D of the second seal groove 29 is the same as that of the first seal groove 24. It may be made shallower than the groove depth D of one seal groove 24.

In each of the above embodiments, as shown in FIG. 2, the casing 2 is divided into the upper casing body 14 and the lower casing body 15, but for example, by dividing both casing

bodies

14 and 15 further vertically. The casing 2 may be divided into a plurality of parts other than two parts, for example, four parts.

In each of the above embodiments, as an example of the pump, as shown in FIG. 1, the double suction centrifugal pump 1 is described, but other types of pumps may be used. For example, in the case of a horizontally-divided multistage pump, the front and rear of each stage are a low pressure part and a high pressure part, respectively, and therefore a second seal groove may be formed between them.

In each of the above-described embodiments, as shown in FIG. 7, when both the joining

surfaces

18 and 20 are joined, the restraint portion 32 of the second seal member 28 and both side surfaces 29a and the bottom surface 29b of the second seal groove 29 Are in contact with each other over the entire surface, but may be in contact with each other instead of the entire surface.

In each of the above embodiments, as shown in FIG. 7, the second seal member 28 has a deformable portion 31 and a restricting portion 32. The deformable portion 31 and the restricting portion 32 are functionally divided. And the deformation | transformation part 31 and the restraint part 32 may be comprised with the same material, or may be comprised combining another material.

In each of the above embodiments, the material of the first and

second seal members

23 and 28 is rubber, which is an example of an elastic material, but is not limited to rubber. For example, urethane or fluororesin , Silicon, or a combination of various materials may have elasticity.

Claims

A casing formed by joining a plurality of casing bodies via joint surfaces, and a low-pressure part and a high-pressure part formed in the casing,
A space between the joint surfaces joined to each other is sealed by a first seal member that prevents fluid from leaking from the inside of the casing to the outside,
The first seal member is a pump made of a string-like elastic material, and fitted in a first seal groove formed on the joint surface of any casing body,
The joint surfaces to be joined to each other are sealed by a second seal member that separates the low pressure part and the high pressure part,
The second seal member is made of a string-like elastic material and is fitted in the second seal groove,
The second seal groove is formed on the joint surface of the casing body having the first seal groove,
In the casing, one end in the longitudinal direction of the second seal member is abutted against the side surface between both ends of the first seal member,
The second seal member has a deformation portion and a restraint portion,
The deformed portion of the second seal member protrudes from the second seal groove onto the joint surface in a state where each casing body is separated, and is easily compressed and deformed in the height direction.
The restraint portion of the second seal member is in contact with the inner surface of the second seal groove in a state where the casing bodies are separated, and it is difficult to expand and deform the second seal groove in the lateral direction and the bottom direction. A pump characterized by that.
One end of the second seal groove communicates with the first seal groove;
The pump according to claim 1, wherein the second seal groove has a shallower depth at the other end.
2. The pump according to claim 1, wherein at least a part of the second seal groove is shallow between both end portions.
The pump according to any one of claims 1 to 3, wherein a cross section of the restraining portion of the second seal member has the same shape as a cross section of the bottom portion of the second seal groove.
The restraint portion of the second seal member has a quadrangular cross section,
The pump according to any one of claims 1 to 4, wherein a cross section of the deformed portion of the second seal member has an arc shape.
The abutting surface formed at one end of the second seal member has the same shape as the side surface of the first seal member. Pump.
7. The method according to claim 1, wherein in a state where the plurality of casing bodies are separated, the filling rate of the second seal member with respect to the second seal groove is within a range of 100 to 140%. The pump according to item.
An accessory is provided between the low pressure part and the high pressure part in the casing,
The pump according to any one of claims 1 to 7, wherein the other end portion of the second seal member is abutted against an accessory part.
The pump according to any one of claims 1 to 8, wherein a cross section of the first seal member has the same shape as a cross section of the second seal member.