JPH0512695U - Water pump sealing device - Google Patents

Abstract

(57) [Summary] [Purpose] The cooling efficiency of the seal is improved by limiting the flow of cooling water to ensure the cooling of the seal. [Structure] In a water pump structure in which the seal position is on the discharge side, a pump case 1 having an impeller 2 incorporated therein and a shell in which the impeller 2 is externally fitted adjacent to a mechanical seal 5 of a pump drive shaft 4. Mechanical housing between the housing and
An annular partition plate 6 having an inner diameter larger than the outer diameter of the seal 5 and penetrating a plurality of holes 6a and 6b is provided on the side surface to hold the mounting surface of the seal housing 3 and the outer periphery of the mechanical seal 5. The cooling water from the pump case 1 is provided between the portion 3a and the hole 6
An annular recess 7 formed to communicate with a and 6b. [Effect] The mechanical seal can be cooled efficiently, and therefore the efficiency of the water pump can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine water pump, and more particularly to a water pump seal device.

[0002]

[Prior Art]

 Conventionally, mechanical seals have generally been used on the shafts of engine water pumps, but since the pump shafts rotate at high speed, problems such as seizure will occur unless the seals are cooled. To do. There are two ways to arrange this seal, one for the water suction side and one for the water discharge side. When it is provided on the suction side, the pump performance will be disturbed by the seal portion, which will disturb the flow. Durability is good, and when it is installed on the discharge side, the pump performance is better than the former, but since the water flow around the seal is small, the cooling performance of the seal is poor and the water pressure around the seal is high. There are advantages and disadvantages in each case. However, basically, if the durability of the seal is confirmed, it is preferable to provide it on the discharge side. Therefore, as the pump structure when the discharge side is selected, there are two types of seal cooling, a balance hole type shown in FIG. 3 and a cooling water channel type shown in FIG. 4, and the former has an impeller 21 and a balance hole 22. By installing the cooling water, the cooling water that entered the body 23 from the entrance as shown by the arrow flows as shown by the arrow → → →, then passes through the balance hole 22 and circulates again, while the seal is in between. In the latter case, a cooling water passage 26 reaching the pump inlet 25 from the vicinity of the seal 24 is provided in the body 23 as shown in the figure, and from the inlet into the body 23 as shown by the arrow. The incoming cooling water flows as shown by arrows → → → →, and cools the seal 24 in the meantime.

[0003]

[Problems to be solved by the device]

 However, when the discharge side is selected as shown in Fig. 3 and Fig. 4, the former must consider down of about 10% in flow rate and about 10% in lifting height as compared with the case without a balance wheel. The cavitation and erosion are also affected, and the latter has a drawback that the cooling water escapes from the cooling water passage 26 without cooling the seal 24.

In view of the above, the present invention is directed to a seal device for a water pump capable of improving the seal cooling efficiency by limiting the flow of cooling water so that the seal can be cooled surely. Is provided to solve the drawbacks of the prior art.

[0005]

[Means for Solving the Problems]

 According to claim 1 of the present invention as means for solving the above-mentioned problems of the prior art, in a water pump structure in which a seal position is a discharge side, a pump case having an impeller incorporated therein and a mechanical structure of a pump drive shaft of the impeller are provided. An annular partition plate having an inner diameter larger than the outer diameter of the mechanical seal and penetrating a plurality of holes on the side surface is provided between the outer housing and the sealing housing fitted outside. An annular recess for communicating cooling water from the pump case through the hole is formed between an attachment surface of the seal housing and an outer peripheral holding portion of the mechanical seal. According to a second aspect of the present invention, at least a pair of weirs having a desired length are provided in the recess in claim 1 so as to extend in the central direction from the large diameter side and regulate the flow direction of cooling water passing therethrough.

[0006]

[Action]

 According to the above construction, the cooling water according to claim 1 flows into the recess from the partition plate through the impeller from the pump case side, so that the mechanical seal in the recess is cooled by this, and in claim 2, the recess is formed. Since the weir is installed in the recess, the cooling water that has flowed into the recess is forcibly regulated by the weir so that the flow direction passes through the mechanical seal, thus further improving the cooling of the mechanical seal. be able to.

[0007]

【Example】

 FIG. 1 is a side sectional view of a seal device for a water pump according to the present invention, and FIG. 2 is a front view of FIG.

According to a first aspect of the present invention, in a water pump structure in which the seal position is on the discharge side, a pump case 1 having an impeller 2 therein and a mechanical seal 5 for a pump drive shaft 4 are provided for the impeller 2. A ring-shaped partition having an inner diameter larger than the outer diameter of the mechanical seal 5 and a plurality of holes 6a and 6b penetrating through the side surface of the partition. A plate 6 is provided, and cooling water from the pump case 1 is communicated between the mounting surface of the seal housing 3 and the outer peripheral holding portion 3a of the mechanical seal 5 through the holes 6a and 6b. The annular recess 7 is formed, and the recess 7 of Claim 1 extends in the central direction from the large diameter side and passes through at least a pair of desired lengths for restricting the flow direction of the cooling water passing therethrough. It is composed of the one with the weir 8 .

An impeller 2 is installed in the pump case 1, and a plurality of water passages 1 a and 1 b communicating with the impeller 2 are provided outside the periphery of the impeller 2 in the front-rear direction. A pump drive shaft 4 is rotatably supported in the seal housing 3 by a bearing 9, a bearing (not shown), an oil seal 10 and the like. The drive shaft 4 has an inner side of a mechanical seal 5 as an outer side. It is fitted. The impeller 2 is externally fitted and fixed to the shaft tip adjacent to the mechanical seal 5. A partition plate 6 is provided between the pump case 1 and the seal housing 3, and both side surfaces of the partition plate 6 near the outer periphery are provided on the pump case 1 and the seal housing 3 sides, respectively. O-ring The pump case 1, the partition plate 6, and the seal housing 3 are integrally fixed to the outer edge by bolts 12 so as to be sealed by the O-ring 11 mounted in the groove. .. Further, the partition plate 6 is provided with a plurality of holes 6a and 6b communicating with the passages 1a and 1b, respectively. The outer circumference of the mechanical seal 5 is held by the outer circumference holding portion 3 a of the seal housing 3. Further, a portion from the mounting surface of the bolt 12 of the seal housing 3 to the outer peripheral holding portion 3a is formed as an annular recessed portion 7, and this recessed portion 7 is more than the holes 6a and 6b provided in the partition plate 6. It has a large diameter. The recess 7 is provided with at least a pair of weirs 8 having a desired length that extends from the large diameter side toward the center and regulates the flow direction of the cooling water passing therethrough.

Next, the operation will be described. In FIG. 1, cooling water flows from a pump case 1 into a passage 1a by a rotating impeller 2 and passes through a hole 6a provided in a partition plate 6 to reach a recess 7 in a seal housing 3. .. Then, after passing through the periphery of the mechanical seal 5, from the concave portion 7 to the hole 6b, to the passage 1b of the pump case 1 and back into the pump case 1, the cycle is repeated. Therefore, the mechanical seal 5 is always cooled by the cooling water. At this time, the cooling water flows along the large diameter side of the concave portion 7 and does not flow near the mechanical seal 5 provided in the central portion. Therefore, when the mechanical seal 5 is not cooled, By providing the weir 8 as shown in FIG. 1 and FIG. 2, the flow is regulated so as to pass through the vicinity of the mechanical seal 5, so that the cooling is forcedly performed.

[0011]

[Effect of the device]

 As described above, according to the present invention, in the water pump structure in which the seal position is on the discharge side, the pump case containing the impeller and the impeller is adjacent to the mechanical seal of the pump drive shaft. An annular partition plate having an inner diameter larger than the outer diameter of the mechanical seal and penetrating a plurality of holes in the side surface between the outer housing and the seal housing. A ring-shaped recess for communicating cooling water from the pump case through the hole is formed between the mounting surface of the mechanical seal and the outer peripheral holding portion of the mechanical seal. Since at least a pair of weirs having a desired length that restricts the flow direction of the cooling water that extends in the center direction is provided, the mechanical seal can be cooled efficiently, and therefore the efficiency of the water pump can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a side cross section of a seal device for a water pump according to the present invention.

FIG. 2 is an explanatory view showing the front of FIG.

FIG. 3 is an explanatory diagram of a balance wheel type of a conventional water pump structure.

FIG. 4 is an explanatory view of a cooling water channel type of a conventional water pump structure.

[Explanation of symbols]

 1 Pump Case 2 Impeller 3 Seal Housing 4 Pump Drive Shaft 5 Mechanical Seal 6 Partition Plates 6a, 6b Holes 7 Recesses 8 Weirs

Claims (2)

[Scope of utility model registration request] 1. A water pump structure in which the seal position is on the discharge side, a pump case containing an impeller, and a seal housing in which the impeller is externally fitted adjacent to a mechanical seal of a pump drive shaft. An annular partition plate having an inner diameter larger than the outer diameter of the mechanical seal and penetrating a plurality of holes on the side surface, and the mounting surface of the seal housing and the mechanical seal. Between the outer periphery of the
A seal device for a water pump, characterized in that an annular recess is formed to allow cooling water from the pump case to communicate through the hole. 2. The recess of claim 1 is provided with at least a pair of weirs having a desired length that restricts the flow direction of the cooling water passing from the large diameter side toward the center. Sealing device for the described water pump.