JPH04105937U - water pump - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the effectiveness of preventing foreign matter from entering the pump body and extend the life of bearings and mechanical seals. [Structure] A cap attachment portion 24 is formed on the upper surface of the pump body 2 and communicates with an opening of a steam exhaust passage 21 of the body. The cap attachment part 24 has a discharge passage 2 that covers the steam discharge passage 21 and communicates with the steam discharge passage 21.
A cap 1 forming a 5 is attached. A flange portion 1a is formed at the lower end of the cap 1 to increase its outer diameter. The muddy water that has covered the top surface of the cap 1 easily falls downward from the outer end of the flange part 1a of the cap 1, and problems such as muddy water being sucked into the pump body 2 due to the siphon effect are prevented. As a result, the discharge path 25
By reducing the gap between the cap attachment part 24 and the cap 1 at the lower end opening, it is possible to prevent dust from entering into the pump body 2 and also prevent muddy water from entering.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a method for circulating engine cooling water in engines such as automobiles. Regarding autopump.

0002

[Conventional technology]

This type of water pump is described, for example, in Japanese Utility Model Application No. 190594/1983. There are some things that have been disclosed. The one in this publication has an impeller at one end of the pump body. A rotating shaft with a rotary shaft is supported via a bearing, and the bearing and the impeller A mechanical seal is provided between the pump body and the mechanical seal. A steam exhaust passage is formed that communicates the space chamber between the roller and the bearing with the atmosphere. There is. As a result, the steam leaking from the mechanical seal part is discharged to the atmosphere, By preventing water from entering inside the bearing, it prevents corrosion and grease leakage. This is intended to prevent the locking phenomenon. In a water pump having a ventilation function as described above, conventionally, for example, the water pump shown in FIG. As shown in the cross-sectional view and FIG. 8 of the VIII-VIII line cross-sectional view of FIG. Steam is formed on the top surface of the pump body 28 (for convenience, the same reference numerals as in the embodiments are used). A cylindrical cap attachment part 24 communicating with the discharge passage 21 is provided, and this attachment The lower part 24 covers the upper part of the steam exhaust passage 21 and communicates with the exhaust passage 21. Some are equipped with a cap 1 that forms a discharge passage 25 in the form of a surface opening. Kya The pipe 1 prevents foreign matter from entering the steam exhaust passage 21, mainly from being thrown up by the running of the vehicle. Rainwater, muddy water, etc. (hereinafter collectively referred to as muddy water), sand, dust, etc. (hereinafter referred to as dust) This prevents the intrusion of foreign substances (generally referred to as dust). Note that such foreign matter may not be present in the steam exhaust passage. If it enters the water pump from passage 21, it may deteriorate the life of the bearings or damage the mechanism. This will lead to problems such as poor sealing of the Lucille.

0003

[Problem that the idea aims to solve]

In a water pump equipped with the cap 1 as described above, the bottom of the discharge passage 25 is If the gap between the cap attachment part 24 and the cap 1 at the end opening is too large, The gap should be made as small as possible to prevent the foreign matter from entering the steam exhaust passage 21. It is desirable that However, if the gap is too small, the gap shown by the two-dot chain line in FIG. The muddy water that has covered the top surface of the cap 1 can be removed from the lower end of the cap 1 and the mounting portion 24. , that is, near the lower end of the discharge passage 25, and the accumulated water After being pushed up into the discharge channel 25 by the muddy water flowing through the Problems such as steam being sucked into the pump body through the steam exhaust passage 21 may occur. For this reason, with conventional products, it is possible to reduce the gap automatically. There were limitations, and we were dissatisfied with the effectiveness of preventing foreign matter from entering the pump body.

0004 Therefore, the present invention was devised to solve the above-mentioned problems. The purpose is to improve the effect of preventing foreign matter from entering the pump body, and to prevent bearings and mechanical parts from entering. It is an object of the present invention to provide a water pump capable of improving the life of Lucille.

[0005]

[Means to solve the problem]

The water pump of the present invention that solves the above problems has the following features: A rotating shaft with an impeller at one end is supported on the pump body via a bearing. A mechanical seal is placed between the bearing and the impeller, and the front A space chamber between the mechanical seal and the bearing is connected to the atmosphere in the pump body. In a water pump in which a steam exhaust passage is formed, a cylindrical cap communicating with the steam exhaust passage on the upper surface of the pump body; A mounting portion is provided, and the mounting portion covers the upper part of the steam exhaust passage and the exhaust passage. A cap that forms a discharge channel with an opening on the bottom that communicates with the channel is attached, and the cap A flange is formed at the lower end of the cup to increase its outer diameter.

[0006]

[Effect]

According to the above means, the outer diameter of the cap is increased by the flange of the cap. As a result, a The volume of the space is increased. Therefore, the muddy water that has covered the top of the cap is The pipes tend to fall downward from the outer edge of the flange and do not accumulate near the bottom end of the discharge path. It becomes.

[0007]

【Example】

[Example 1] Embodiment 1 of the present invention will be described according to the drawings. FIG. 4 shows a front sectional view of the water pump. In the figure, the water pump The casing 11 of the pump consists of a pump body 2 which forms the main body, and one side of the body 2. (on the right side in the figure) and a pump cover 3 connected via a gasket 12. The pump body 2 has an opening that forms a pump chamber 14 with the pump cover 3. A mouth hole 15, and an outer end connected to the mouth hole 15 through an intermediate hole 16 and a side surface of the body. A bearing mounting hole 17 opened on the same axis is provided. Naopon The pump chamber 14 is connected to the engine cooling water circulation path of an automobile as part of the same path. It will be done.

[0008] A rotary shaft 19 is rotated through the bearing mounting hole 17 via the bearing 4. supported in a rotatable manner. One end of this rotating shaft 19 (the right end in the figure) is It extends to the pump chamber 14, and the impeller 5 is attached to its end. Ma The other end of the rotary shaft 19 protrudes from the side surface of the pump body 2, A pulley seat 7 is attached to the end thereof by press fitting. A pulley 8 and a fan coupling 10 are mounted on a stud bolt on the pulley seat 7. They are connected by gate 9. As is well known, the pulley 8 is used to rotate the engine, etc. The transmission belt (not shown) of the power transmission mechanism for transmitting the driving force of the rotational drive source is hooked up. equipped. Therefore, the pulley 8 is rotated based on the drive of the rotational drive source. The rotating shaft 19 rotates, and the pump action by the impeller 5 is activated. be given

[0009] A mechanical seal 6 is provided between the bearing 4 and the impeller 5. Ru. Since the mechanical seal 6 is well known, a detailed explanation thereof will be omitted. , a fixed side member fixed to the intermediate hole 16 side and a fixed side member fixed to the rotating shaft 19 side. The pump chamber 14 is kept airtight by providing a rotary side member that is connected to the pump chamber 14. Further, in the pump body 2, there is a gap between the bearing 4 and the mechanical seal 6. A steam exhaust passage 21 and a drain exhaust passage 22 communicating with the space chamber 20 are formed. There is. A drain discharge passage 22 extends from the bottom of the space chamber 20 to the pulley seat 7. They are formed in a substantially L-shape so that they face each other.

0010 The steam exhaust passage 21 extends vertically upward from the top of the space chamber 20 and has a port. It opens on the upper surface of the pump body 2, and allows the space chamber 20 to communicate with the atmosphere. This exclusion The outlet passage 21 connects the fixed side member and the rotating side part of the mechanical seal 6 during pump operation. Water vapor leaks from the pump chamber 14 to the space chamber 20 due to heat generated at the sliding contact surface with the material. It has a ventilation effect such as

[0011] The upper surface of the pump body 2 is connected to the opening of the steam exhaust passage 21. A cylindrical cap attachment portion 24 is formed through which the cap attachment portion 24 is inserted. The cap attachment part 24 covers the steam exhaust passage 21 and has a Cap 1 is attached to prevent foreign matter such as muddy water and dust from entering the Ru. The attachment part of this cap 1 is shown enlarged in FIG. 1, and II-II in FIG. A cross-sectional view is shown in FIG.

0012 The cap 1 has a cylindrical shape with a bottom, and a cross-shaped mounting piece 27 is provided on the bottom surface of the cap 1. is formed. A stepped portion 28 is formed on the mounting piece 27, and the tip side thereof is The surface is in surface contact with the inner surface of the cap attachment part 24, and the stepped surface is in contact with the inner surface of the cap attachment part 24. The cap 1 is attached to the cap mounting portion 24 so as to be in contact with the end surface of the mounting portion 24. It is fitted. Thereby, between the cap 1 and the cap attachment part 24, the A discharge passage 25 having an open bottom surface and communicating with the steam discharge passage 21 is formed. Naoki Cap 1 has an inverted U-shaped turn on its side, as shown in perspective view in Figure 3. A stop groove 29 is formed. This anti-rotation groove 29 is formed in the pump body 2. The cap 1 is engaged with the rib 30 formed in the cap 1 to prevent the cap 1 from rotating (see FIG. 4).

[0013] Furthermore, as shown in FIGS. 1 to 4, the lower end of the cap 1 has an outer diameter A flange portion 1a is formed to increase d. Note that cap 1 has low thermal conductivity. It is integrally formed from a synthetic resin material.

[0014] According to the water pump, the flange 1a of the cap 1 By increasing the outer diameter d of the cap 1, the lower part of the cap 1 and the cap attachment part 24 are The volume of the space formed at the corner with the surrounding area (see the two-dot chain line S in Figure 1) is increased. It will be done. For this reason, as shown by the arrow in Figure 1, the The muddy water tends to fall downward from the outer end of the flange 1a of the cap 1, and the drain passage 25 is It becomes difficult to accumulate near the bottom edge. Therefore, due to the siphon phenomenon, the steam enters the pump body 2 through the steam discharge passage 21. Problems such as being sucked in are prevented. As a result, the lower end opening of the discharge passage 25 By reducing the gap between the cap mounting part 24 and the cap 1 at The intrusion of muddy water is effectively prevented while preventing the intrusion of dust into the interior of the tray 2.

[0015] Note that the gap area B between the outer peripheral surface of the cap attachment part 24 and the inner peripheral surface of the cap 1 is , by setting the passage area A of the steam exhaust passage 21 to 1 to 2 times, the steam discharge resistance can be reduced. The gap width C between the cap mounting portion 24 and the cap 1 can be set small without increasing the It is possible to determine

[0016] [Example 2] Example 2 of the present invention will be described. This example is a partial modification of Example 1. Therefore, by assigning the same reference numerals to the same parts, the explanation thereof will be omitted and different configurations will be indicated. I will only explain this in detail. Figure 5 shows a cross-sectional view of a part of the water pump of this example. , and an enlarged view of the main parts is shown in FIG. In this example, an annular groove 1b is formed on the lower end surface of the flange 1a of the cap 1. In both cases, the wall on the cap attachment part side of the annular groove 1b is formed lower than the outer wall. be.

[0017] This example also provides the same effects as the first example. In this case, the implementation Compared to Example 1, it is formed at the corner between the lower part of the cap 1 and the periphery of the cap attachment part 24. Since the volume of the space (see the two-dot chain line S in Figure 6) is further increased, muddy water intrusion is prevented. The effect of preventing entry is enhanced. In addition, the wall of the annular groove 1b on the cap attachment side allows the To prevent water splashed on the upper surface of the pump body 2 from entering, compared to a case without a wall. I can do it. It should be noted that the present invention is not limited to the above-mentioned Examples 1 and 2, and may depart from the gist of the present invention. Changes can be made within the scope of the change.

[0018]

[Effect of the idea]

According to the present invention, the flange of the cap allows the steam to flow from the steam exhaust passage into the pump body. By increasing the effectiveness of preventing foreign matter from entering, bearings and mechanical seals can be This improves the service life of the water pump, which in turn improves the durability of the water pump.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a perspective view of the cap.

FIG. 4 is a front sectional view of the water pump.

FIG. 5 is a sectional view showing a part of the water pump according to the second embodiment.

FIG. 6 is an enlarged view of the main part of FIG. 5;

FIG. 7 is a sectional view of a main part showing a conventional example.

8 is a cross-sectional view taken along the line VIII-V1II in FIG. 7. FIG.

[Explanation of symbols]

1 cap 1a Tsuba 2 Pump body 21 Steam exhaust passage 25 Discharge path

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft having an impeller at one end is supported by a pump body via a bearing, a mechanical seal is disposed between the bearing and the impeller, and a mechanical seal is disposed between the mechanical seal and the bearing. In this water pump, a cylindrical cap attachment part is provided on the upper surface of the pump body and communicates with the steam exhaust passage, and the attachment part is provided with a cylindrical cap attachment part that communicates with the atmosphere. A water pump is provided with a cap that covers the upper part of a discharge passage and forms a discharge passage with an opening on the lower surface that communicates with the discharge passage, and a flange part that increases the outer diameter of the cap is formed at the lower end of the cap.