WO2006137714A1

WO2006137714A1 - A hermetic subsurface water deep well cover equipment

Info

Publication number: WO2006137714A1
Application number: PCT/KR2006/002436
Authority: WO
Inventors: Heuy-Nam Cho
Original assignee: Heuy-Nam Cho
Priority date: 2005-06-24
Filing date: 2006-06-23
Publication date: 2006-12-28

Abstract

A hermetic subsurface water deep well cover equipment couples a discharge pipe and a feed pipe without leakage of water while maintaining an inner diameter of an outer casing of the groundwater well without change, and facilitates assembly and disassembly. The hermetic subsurface water deep well cover equipment includes a well head protector casing coupled to an outer casing and provided with a feed port, a lower disk ring welded to an inner circumferential surface of the well head protector casing, a fixed support placed on the lower disk ring and coupled to center a discharge port of a pumping pipe head with the feed port of the well head protector casing, and an advancing unit moving the pumping pipe head forward and backward to couple the discharge port of the pumping pipe head to the feed port of the well head protector casing.

Description

A HERMETIC SUBSURFACE WATER DEEP WELL COVER EQUIPMENT

BACKGROUND OF THE INVENTION

Field of the invention

The present invention relates to a hermetic subsurface water deep well cover equipment. More particularly, the present invention is directed to providing a mechanism coupling a discharge port to a feed port by advancing and pressing the discharge port toward the feed port using a worm gear and a worm wheel gear, and after installation, coupling the discharge port to the feed port without leakage of water while maintaining the inner diameter of an outer casing of the groundwater well without change, as well as facilitating assembly and disassembly while having a sealed structure, thereby remarkably improving quality and reliability of the apparatus, and installing a water meter etc. in the well head protector without a separate manhole .

Description of the Prior Art

As well known in the art, groundwater is water filling or flowing in the empty spaces or pores between underground strata or bedrocks. Recently, groundwater has been mixed with various contaminants, thereby being deteriorated in quality.

Conventionally, this problem has been solved in such a manner that contaminated surface water has been prevented from flowing into the groundwater by using a well head protection facility by which the surroundings of a groundwater well have been located higher than the ground, or that the contaminants have been prevented from intruding into a groundwater well by installing a cover apparatus. However, the cover apparatus for the groundwater well has been usually in an opened state, thus serving as a habitat for insects. Especially, when a flood has risen, the contaminated surface water may be introduced into the groundwater well without any resistance. Consequently, the cover apparatus can not help stop the groundwater from being seriously contaminated.

Therefore, in order to solve the problem of the opened cover apparatus, there has been proposed a technique capable of fundamentally preventing contaminated substances from being introduced from an upper portion of the groundwater well by changing the cover apparatus to a closed type.

However, the conventional closed cover apparatus has produced an effect of firmly sealing off the^' inside from the outside of the groundwater well, but there has been a problem as follows.

In order to firmly seal off between the inside and outside of the groundwater well by using the groundwater well cover apparatus, it has been important to provide close shielding between a closed groundwater well cover and an outer casing that has been inserted underground and drawn above the ground level, but it has been considered to be more important how to couple a feed pipe to a pumping pipe because the coupling has decided the size and structure of an upper protection manhole.

More specifically, the conventional closed type groundwater well cover could not be constructed of the same body as a check valve, water meter, and shutoff valve that have sequentially been connected with the pumping pipe at an upper portion of the cover.

Further, there have been studied together various plans for saving installation cost of a well head protector for the groundwater well, wherein the well head protection facility is installed in order to protect the closed cover from external influences in the process of installing the closed groundwater well cover. However, in order to meet standards for the well head protector of the groundwater well stipulated in Korean Groundwater Law, it is essentially necessary to use heavy equipment such as an excavator, as well as much labor force. For this reason, the installation of the well head protector costs a great deal. This is because the Groundwater Law is revised to allow the standards for the well head protector to be freely varied only when the closed groundwater well cover must be installed.

Further, conventionally, when a groundwater well pump is lifted, a pumping pipe is de-coupled from the groundwater well pump. In this manner, the de-coupling process and re-coupling process require skilled piping engineers, so that there is no alternative but to incur high cost.

Also, in the case of some apparatuses, the inner diameters of their outer casings are reduced in the process of manufacturing their structures in a closed type, so that the workability is seriously lowered in lifting and reinstalling the groundwater well pump and the pumping pipe. In addition, a discharge port and a feed port are coupled so as to prevent leakage of water via a packing simply pressed by the dead weight of the groundwater well pump and the pumping pipe. Hence, when high hydraulic pressure is formed, the possibility of the leakage is high.

Meanwhile, in the case of small- and medium-diameter groundwater wells, a pumping piping is typically constructed to install the water pump on the ground, and a jet device in the groundwater well. The discharge and feed ports of the groundwater well cannot be coupled by the conventional closed cover apparatus while maintaining the same level as the ground level.

Further, in order to solve these problems, the inventor of the present invention has invented a discharge port advancing coupler of a closed well head protector apparatus for a groundwater well, which is disclosed in Korean Patent Application No. 2004-0047325 and Utility Model Registration Application No. 2004-0019357. Nevertheless, the inventor has found that, when the advancing coupler is constructed by mechanical combination and functions without an air or hydraulic cylinder, it simply employs a conical rod and clamping nuts and bolts, so that a considerably great force must be applied to a pumping pipe head to slide forward on a fixed support due to a frictional force, and that it is required to improve the advancing coupler so that the pumping pipe head can slide forward with an external weak rotational force.

Meanwhile, in order to firmly seal off the inside from the outside of the groundwater well by using the groundwater well cover apparatus, it is important to closely shield the gap between the groundwater well cover and the outer casing that is inserted underground and drawn above the ground level, but it is also considered to be important how to couple the feed pipe passing through the sealing cover to the pumping pipe because the coupling decides the size and structure of a well head protection manhole .

As a conventional method used to couple the discharge pipe coupled with the pumping pipe and the feed pipe inside the closed well head protector apparatus for a groundwater well, a hose or union coupling method has been used. This coupling method has an advantage in that the two pipes can be coupled inside the closed well head protector apparatus for a groundwater well through manual work using simple tools. However, because the two pipes are located in the same space, the well head protector apparatus has no choice but to have an excessive diameter, and when the groundwater well pump is lifted or installed, the feed pipe spaced apart on one side interferes with the groundwater well pump or the pumping pipe and a flange for coupling the pumping pipe, so that lifting or installing work cannot be smoothly- carried out, and furthermore there is a high breakage danger in regards tc the feed pipe. In order to solve these problems, various techniques have been developed for the closed well head protector apparatus for a groundwater well, and furthermore the well head protector apparatus has been considerably developed to have a small diameter. However, in order to improve the convenience of work and secure a separate space for installing the water meter and check valve, a separate manhole for protection has been installed beside the closed well head protector apparatus, or the water meter, check valve and gate valve have been installed inside a pumping post. Thereby, the well head protector apparatus is simplified in a closed type, while its accessories are complicated, and thus the costs for the accessories increase.

SUMMARY OF THE INVENTION

Accordingly, the present invention has been made to solve these various problems occurring in the prior art, and an objective of the present invention is to provide a closed well head protector apparatus for a groundwater well, in which a discharge port and a feed port are coupled without leakage of water while the inner diameter of an outer casing of the groundwater well is maintained without change, and assembly and disassembly are facilitated while having a sealed structure, thereby remarkably improving quality and reliability of the apparatus.

It is another objective of the present invention to provide a closed well head protector apparatus for a groundwater well, in which a feed pipe pocket having a separate partition space is provided to a closed well head protector casing so as to install a feed pipe in the feed pipe pocket, and interference between a discharge pipe and the feed pipe is removed while a diameter of the apparatus is maintained to be small, thereby removing the inconvenience of work by lifting and installing a well pump, and improving the convenience of coupling of the discharge port and the feed port.

It is yet another objective of the present invention to provide a closed well head protector apparatus for a groundwater well, in which a check valve, water meter, and drain cock are installed inside the closed well head protector casing, thereby simplifying its construction. In other words, the present invention is directed at providing technology to make it convenient and simple to couple a discharge port to a feed port inside a closed well head protector casing using a hose coupling or union while a diameter of the closed well head protector casing is maintained to be small, of simplifying an overall structure and construction of the closed well head protector casing, and of sufficiently installing accessories, i.e. a check valve, water meter, and drain cock.

In order to accomplish these objectives, there is provided a closed well head protector apparatus for a groundwater well, characterized in that a pumping pipe head is installed to linearly reciprocate in a well head protector casing through an advancing means.

Here, the advancing means may include a worm gear and a worm wheel gear, and the pumping pipe head may move forward and backward through the worm wheel gear by rotation of the worm gear.

Further, the closed well head protector apparatus may further include a feed pipe pocket for receiving a feed pipe in the well head protector casing.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objectives, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a partly cut perspective view of a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of a discharge port advancing means applied to a closed well head projector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 3 is a partly cut perspective view illustrating a coupled state of a pumping pipe head and a lower disk ring of a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 4 is a perspective view illustrating a rotational cam of a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 5 is a top plan view illustrating a rotational cam of a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 6 illustrates a coupled structure of a rotational cam of a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention; FIG. 7 is a perspective view illustrating a handle for rotating a worm gear applied to a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention; FIG. 8 is a perspective view illustrating a discharge port advancing means applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 9 is an installation cross-sectional view illustrating a discharge port advancing means applied to a

1.0 closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 10 is a perspective view illustrating a discharge port advancing means coupled with a bolt bar and applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 11 is a top plan view illustrating a discharge port advancing means coupled with a bolt bar and applied to a closed well head protector apparatus for a groundwater well according to a first embodiment of the present invention;

FIG. 12 is a cross-sectional view illustrating an overall construction of a closed well head protector apparatus for a groundwater well according to a second embodiment of the present invention;

FIG. 13 is a perspective view illustrating a closed well head protector apparatus for a groundwater well according to a second embodiment of the present invention; FIG. 14 is a magnified cross-sectional view illustrating an important part of a feed pipe pocket applied to a closed well head protector apparatus for a groundwater well according to a second embodiment of the present invention; and FIG. 15 is a cross-sectional view illustrating a coupled state of a hose feed pipe applied to a closed well head protector apparatus for a groundwater well according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

Further, the rerms to be described below are defined according to functions associated with the present invention. The terms can be varied by an intention or practice of a user or operator, and thus their definitions should be determined based on the following description.

A closed well head protector apparatus for a groundwater well applied to the present invention is constructed as shown in FIGS. 1 through 11. {Embodiment 1}

A reference numeral 10, shown in FIGS. 1 through 3, indicates a well head protector casing, which is fixed to an outer casing (not shown) for a groundwater well by welding or flange coupling. A lower disk ring 11 is attached to an inner circumferential surface of the well head protector casing 10. The lower disk ring 11 has a thickness of about 20 mm and a diameter smaller by about 10 mm than that of the well head protector casing 10, thereby being formed as a circular clamping step. Of course, when being connected to the outer casing having the diameter smaller than that of the well head protector casing 10, the lower disk ring 11 is adapted to be directly connected due to its small diameter, thus being fixed and finished on an upper end of the small-diameter outer casing.

The inner circumferential surface of the well head protector casing 10, on which the lower disk ring 11 is fixed, is vertically provided with fitting protrusions 12

(shown in FIG. 3), which are symmetrical with respect to the center axis of the well head protector casing 10.

A fixing support 20, which is provided with support recesses 21 on opposite sides thereof so as to be able to adopt the fitting protrusions 12 as guides in the future, is seated on the lower disk ring 11. The fixing support 20 is installed so that the center line of a feed port 13 is matched with that of the discharge port 31 of a pumping pipe head 30 by the fitting protrusions 12 and the support recesses 21. The fixing support 20 is cut off in a diametrical direction thereof with a width slightly greater than an outer diameter of the pumping pipe head 30, thereby securing an opening 22 to allow the pumping pipe head 30 to be located in the middle thereof. At this time, the pumping pipe head 30 is formed with a sliding ring 32 so that it can slide in the opening 22 of the fixing support 20.

Further, the fixing support 20 is provided with a water level measurement pipe hole 23 through which a water level measurement pipe 1 is inserted and extended up to an upper portion of the well head protector casing 10, a power line hole 24 through which a power cable 2 for transmitting power to a well pump (not shown) and a water level detection line 3 installed to detect a water level are inserted. Of course, when a pumping pipe 40 is made of a weak material such as plastic, polyethylene (PE) etc. rather than steel, the fixing support 20 can be additionally formed with a hole for both bearing the weight of the well pump and installing a lifting rope used for lifting installation.

Here, the fixing support 20 may be varied while maintaining its function. For example, the fixing support 20 may be adapted to fix "wo flat steel plates having a sufficient thickness at parallel positions to be laid across the lower disk ring 11 so as to be able to construct an advancing means 50 (to be described below in detail) while withstanding loads of the pumping pipe 40 and the well pump. In this case, it is not necessary to separately form the water level measurement pipe hole 23 and the power line hole 24 because the opening can increase in size, but the support recesses 21 fitted with the fitting protrusions 12 formed in the inner surface of the well head protector casing 10 are essentially required. Alternatively, the fitting protrusions 12 formed in the inner surface of the well head protector casing 10 may be merely implemented as symmetrical protrusions around the lower disk ring 11, so that they can be fitted into the support recesses 21.

The fixing support 20 is provided with bolt holes so as to bolt the advancing means 50. To this end, the fixing support 20 can be formed with a female thread, fastened with a nut below the bolt hole, or welded. Hereinafter, embodiments of the advancing means applied to the closed well head protector apparatus for a groundwater well in accordance with the present invention will be described. [Embodiment 1] As illustrated in FIGS. 2 and 4, the advancing means 50 is comprised of a body 51 that is similar to a gear box having built-in gears and is bolted or welded to a fixing support 20, a worm gear 52 that is integrally formed on a worm gear shaft 52a and mounted in the body 52, a worm wheel gear 53 that is engaged with the worm gear 52, and a rotational cam 54 that is rotated by the worm wheel gear 53.

The rotational cam 54 can be adapted to be integrated with the worm wheel gear 53, or designed so that rotational force of the worm wheel gear 53 can be transmitted to the rotational cam 54 without a loss by forming a shaft hole 53a to the worm wheel gear 53, and then inserting a rotational shaft 54a extending from the rotational cam 54 into the shaft hole of the worm wheel gear 53, as illustrated in FIG. 5. Of course, the shaft hole 53a can be formed as a guadrangular hole or have a construction in which a key groove is formed in a circular hole. The rotational cam 54 is coupled with the rotational shaft 54a at the center different from, rather than equal to, the worm wheel gear 53. In other words, the rotational cam 54 eccentrically coupled with the worm wheel gear 53 is so designed that the rotational shaft 54a formed as a quadrangular rotational rod is coupled to the shaft hole 53a constructed to allow a key to be inserted into the key groove at the center of the worm wheel gear 53. Thereby, when the worm wheel gear 53 rotates, a specified part of the circumferential surface of the rotational cam 54 can move from the nearest distance to the farthest distance about the center of the worm wheel gear 53. Of course, it is possible to obtain the same result by combination of

1.6 multiple worm wheel gears 53 instead of the worm gear 52. In Embodiment 1, the rotational cam 54 moves its pressing surface while rotating in a vertical direction, but it may move the pressing surface while rotating in a horizontal direction. However, regardless to whether the rotational cam 54 operates in the vertical or horizontal direction, the pressing surface is disposed to be perpendicular to a virtual line extending from the center of the rotational shaft 54a of the rotational cam 54 at all times. As a result, although a drag takes place at a pumping pipe head 30, the rotational cam 54 is prevented from being reversely rotated and pushed, so that leakage of water is prevented from being generated at a coupled portion.

Further, a compression spring (not shown) is interposed between a discharge port 31 and a feed port 13, so that the discharge port 31 is readily separated from the feed port 13 when the pressing surface of the rotational cam 54 moves back.

In addition, a rear surface of the pumping pipe head 30 is constructed to have a rectangular flat surface, and a pressing protrusion 33 is formed at a height capable of contacting the pressing surface of the rotational cam 54 of the advancing means 50.

For the operation of the advancing means 50, an upper end of the worm gear shaft 52a is formed with a hexagonal bolt head 52b (shown in FIG. 6) , and an advancing handle 55 is used, as illustrated in FIG. 7. The advancing handle 55 is composed of an extension rod 55a, and a handle section 55b and a boss 55b formed upper and lower ends of the extension rod 55a respectively. [Embodiment 2]

As illustrated in FIGS. 8 and 9, the advancing means 50 of the present embodiment is comprised of a body 51 similar to a gear box having built-in gears and is bolted or welded to a fixing support 20. A worm wheel gear 53 is integrally connected to a pinion 56 so that rotational force of the worm wheel gear 53 can be transmitted to the pinion 56. When a worm gear 52 rotates, the worm wheel gear 53 rotates. This rotational force is transmitted to the pinion 56, and thereby the pinion 56 horizontally pushes or pulls a pair of quadrangular racks 34. At this time, one end of the rack 34 is fixed to the central rear surface of a discharge port 31 of a pumping pipe head 30. Hence, when the rack 34 moves forward, the discharge port 31 moves toward the feed port 13. The gear ratio is about 1:30. Although a weak rotational force is applied to the worm gear 52, a reduction gear ratio is formed between the pinion 56 and the rack 34, so that the rack 34 is supplied with a strong advancing force. As a result, the discharge port 31 can be coupled to the feed port 13 without leakage of water by a strong pressing force. [Embodiment 3]

As illustrated in FIGS. 10 and 11, the advancing means 50 of the present embodiment is comprised of a body 51 similar to a gear box having built-in gears and is bolted or welded to a fixing support 20. In the advancing means 50, a worm gear 52 is integrally fixed to a rotational shaft and is engaged with a worm wheel gear 53 so that the worm wheel gear 53 can rotate. The worm wheel gear 53 is adapted to integrally connect a bolt bar 57 to a rotational shaft 54a and to attach a female threaded cylindrical rod 58 in and out which the bolt bar 57 can come when rotating to a pumping pipe head 30. When the worm gear 52 rotates, the worm wheel gear 53 rotates according to a reduction gear ratio. This rotational force rotates the bolt bar 57. Of course, at this time, the bolt bar 57 maintains a very small number of revolution over that of the worm gear 52 due to a reduction gear ratio, but the magnitude of its rotational force becomes greater, thereby pushing and advancing the female threaded cylindrical rod 58. This advancing force acts as a coupling force between a discharge port 31 and a feed port 13. At this time, its opposite reaction force acting on the opposite side serves as a pressing force transmitted from the bolt bar 57, the worm wheel gear 53, and the rotational shaft 54a to the gear box-like body 51. Hence, the gear box-like body 51 is designed to have strength sufficient to withstand the pressing force, so that the function of the advancing means 50 is not deteriorated. Of course, the advancing means 50 may be constructed in such a manner that a general geared motor actuated by electrical power is connected to the shaft of the worm wheel gear 53 to which reduction gears are mounted. In this case, a rotational force of the geared motor can be controlled through a sensor such as a load cell, which has been typically used.

Further, a sliding ring is inserted in the pumping pipe head 30 at a height decided to move forward and backward when the discharge port 31 is positioned on the same center line as that of the feed port 13.

A leading end of the discharge port 31 of the pumping pipe head 30 is formed in a conical shape and inserted by at least one O-ring 35.

Meanwhile, with respect to the application of the above-described construction, the present invention can be variously modified and have various types.

It should be understood that the present invention is not limited to the detailed embodiment referred tc in the detailed description, but rather includes all modifications, variations, equivalents and substitutions that fall within the scope of the invention as defined by the appended claims.

An operation of the well head protector apparatus for a groundwater well as constructed above will be described below.

The pumping pipe head 30 is coupled to the previously installed pumping pipe 40 by bolts and nuts or by screws, and is thereby located inside the groundwater well. The fitting protrusions 12 of the lower disk ring 11 of the well head protector casing 10 are exactly fitted to the support recesses 21 of the fixing support 20, and thereby the discharge port 31 is vertically centered with the feed port 13. Further, because the fixing support 20 is fixed or adjusted to the slide ring of the pumping pipe head 30 at a preset height, the discharge port 31 is horizontally centered with the feed port 13. After it is confirmed that the fixing support 20 is fixed or adjusted to the slide ring of the pumping pipe head 30 in a state in which the discharge port 31 is vertically and horizontally centered with the feed port 13, the worm gear 52 can be driven in the advancing means 50. To this end, a lid of the well head protector casing 10 is opened, the boss 55c of the advancing handle 55 is inserted into the hexagonal bolt head 52b formed to the worm gear shaft 52a. Then, when the boss 55c is rotated, the rotational cam 54 rotates. In the case of Embodiment 1, because the rotational shaft 54a is eccentrically fixed, the circumferential surface of the rotational cam 54 distant from the rotational shaft 54a pushes and advances the pumping pipe head 30, and thereby the discharge port 31 can be strongly coupled to the feed port 13. Further, in the case of using the pinion 56 as in Embodiment 2, the worm gear 52 is driven to rotate the worm wheel gear 53, and thereby the pinion 56 connected to the same rotational shaft 54a as the worm wheel gear 53 rotates. Thus, the rack 34 fixed to the pumping pipe head 30 strongly pushes and pulls the pumping pipe head 30 toward the feed port 13, so that watertight strong coupling can be obtained even at a high hydraulic pressure. In the case of Embodiment 3, when the worm gear 52 is rotated, the worm wheel gear 53 rotates according to a reduction gear ratio. This rotational force rotates the bolt bar 57 connected to the worm wheel gear 53. Of course, at this time, the bolt bar 57 maintains a very small number of revolution over that of the worm gear 52 due to a reduction gear ratio, but the magnitude of its rotational force becomes greater. Further, because a part of the bolt bar 57 is already inserted in the female threaded rod 58 at a fixed position, the rotation of the bolt bar 57 immediately pushes and advances the female threaded rod 58. This advancing force acts as a coupling force of the discharge port 31 and the feed port 13. When intending to separate the discharge port 31 from the feed port 13, the advancing handle 55 rotating the worm gear 52 is reversely rotated.

At this time, both the discharge port 31 and the feed port 13 are vertically and horizontally centered with each other. Hence, when forced press coupling is carried out, sealing ability is secured by the 0-ring 35 provided to the discharge port 31. Accordingly, water feed is possible without leakage under high operating pressure. {Embodiment 2}

As illustrated in FIGS. 12 through 15, a closed well head protector apparatus for a groundwater well according to the present embodiment is as follows.

In order to prevent contaminated surface water from flowing into the groundwater well, grouting work is performed. In the grouting work, the lower end of a well head protector casing 10 and the upper end of an outer casing 60 are formed with flanges 14 and 61, respectively, in order to couple the closed well head protector casing 10 to the upper end of the outer casing 60 that is drawn above the ground level with a grouting slurry wall formed. A rubber packing is interposed between the flanges 14 and 61, and then the flanges 14 and 61 are bolted or welded. Of course, the closed well head protector casing 10 and the outer casing 60 are directly welded without the flanges 14 and 61.

The closed well head protector apparatus for a groundwater well according to the present embodiment is comprised of a well cover 70 connected with a pumping pipe 40, a lower support 15 on which tπe well cover 70 is seated, a hose feed pipe 80 connected to the well cover 70, and a feed pipe pocket 90 constructed so that the hose feed pipe 80 is housed in the closed well nead protector casing 10. The lower support 15 is installed in the closed well head protector casing 10 through a connecting casing 16, and has an inner diameter slightly smaller than that of the closed well head protector casing 10 and a thickness capable of withstanding a sufficient load. Of course, the lower support 15 may be installed to the well head protector casing 10 without the connecting casing 16. In this case, as illustrated in FIG. 15, the lower support 15 is constructed as a lower blocking step 17a naturally formed by making its inner diameter equal to that of the outer casing 60 and greater than that of the closed well head protector casing 10, wherein the lower blocking step 17a also has the same purpose as the lower support. The well cover 70 is placed across the lower support 15 so as to support the pumping pipe 40, and a discharge pipe 4 passes through the well cover 70. Of course, when the well cover 70 is directly seated and coupled on the lower blocking step 17a, the same purpose can be accomplished. A check valve 5 and a water meter 6 are provided around the well cover 70 in that order. An upper portion of the discharge pipe 4 has a drain cock 7 for draining water in the discharge pipe 4, in order to sample a part of pumped groundwater to perform a water test, or to prevent an accident that may be generated by a repulsive force caused by a hydraulic pressure generated when the discharge pipe and feed pipe in which a high hydraulic pressure is maintained in a state where a well pump is stopped are decoupled. Of course, the well cover 70 is separately provided with through-holes for passing a power cable supplying electricity in order to drive the well pump and for installing a water level measurement pipe 8. The discharge pipe 4 connected to the well cover 70 generally includes a stainless steel pipe.

The well cover 70 typically takes a disk shape, but it may be formed by using an "H" steel section. Any shape will do if the well cover 70 has a structure in which after it is seated on the lower support 15 or the lower blocking step 17a, it is capable of withstanding and supporting a load of the well pump or the pumping pipe 40 and giving no trouble to install the level measurement pipe 8 or the power cable. In this case, the well cover 70 is unnecessary to separately provide the through-holes for passing the power cable and the water level measurement pipe 8, and takes the shape of a typical clamp fixed to the pumping pipe 40. The feed pipe pocket 90 having a width capable of housing the hose feed pipe 80 is fixed to an outer circumferential edge of the well head protector casing 10. To this end, the outer circumferential edge of the well head protector casing 10 is cut out to form an opening, and then the feed pipe pocket 90 is folded in a semi-oval shape or in a "C" shape and welded to the outer circumferential edge of the well head protector casing 10. Accordingly, the feed pipe pocket 90 has upper and lower ends closed. The upper end of the feed pipe pocket 90 contacting the closed well head protector casing 10 is formed with a clamping step 17. A feed pipe socket 91 is installed below the feed pipe pocket 90. A side of the feed pipe pocket 90 is formed with an air vent pipe socket 92 for connecting an air vent pipe and a power cable socket 93 for connecting the power cable. When separating the hose feed pipe 80 from the discharge pipe 4, the hose feed pipe 80 is left swinging inside the well head protector casing 10, thereby colliding or interfering with the well pump and the pumping pipe 40 when the well pump and the pumping pipe 40 are installed and lifted. Hence, the clamping step 17 aims at allowing the hose feed pipe 80 to be located in the feed pipe pocket 90 on the inside thereof, by contracting the hose feed pipe 80 with weak force, and then relaxing the hose feed pipe 80 on the inside thereof. Further, a heat-insulating material is attached to inner circumferential surfaces of the closed well head protector casing 10 and the feed pipe pocket 90, thereby preventing rupture of the pipes in the winter season. Of course, separate anti-rupture hot wires, which have been typically used, may be installed inside the closed well head protector casing, thereby having an anti-rupture effect.

Also, in a state where the discharge pipe 4 made of a stainless steel does not exist, by providing a hose connector 81 to the well cover 70 and using the hose feed pipe 80 as a general high-pressure rubber or nylon hose, it is possible to further lower a position of the hose connector 81, when compared to a state where the discharge pipe 4, made of stainless steel, is constructed to complete the coupling before the well cover 70 is seated onto the lower support 15 when the well pump and the pumping pipe 40 are installed. At this time, it is possible to produce an effect of simplifying their components.

Among the reference numerals which are not yet described, 19 is an upper cover of the well head protector casing 10, 19a is a packing, 8a is a water level measurement pipe cap, 8b is a water level measurement pipe guide installed so as to help erectness of the flexible level measurement pipe 8, and 82 is a feed pipe elbow. As described in detail above, according to the well head protector apparatus for a groundwater well of the present invention, the structure of the well head protector facility can be easily changed without reduction or change of the inner diameter of the existing groundwater well, and the installation of the well head protector can be completed in a narrow area. Further, conventionally, when the closed well head protector is installed, an effective inner diameter is reduced. Hence, internal components of the groundwater well must be installed before the closed well head protector is installed, so that it is difficult to adjust a term of construction. In contrast, in the present invention, after the well head protector casing is installed, a sufficient effective diameter is maintained. Such internal components of the groundwater well can be installed at any time, thereby providing the great, convenience of installation. Furthermore, the well head protector facility can be downsized, and the well pump and the pumping pipe can be installed and lifted at a subterranean deep site. Thereby, it is possible to save labor force and time, so that quality and reliability of the product can be remarkably improved.

The feed pipe pocket is constructed as a separate space connected to the inside of the closed well head protector casing. Thereby, it is possible to solve the conventional problem where the discharge pipe and the hose feed pipe are installed in the same space, i.e. the closed well head protector casing, and thereby there is no alternative but to excessively increase the diameter of the closed well head protector casing, thus requiring much labor force and expense for transportation and installation.

Further, the check valve, the water meter, and the drain cock are installed inside the closed well head protector casing. Thereby, it is possible to solve the conventional problem that there is no alternative but to install a separate manhole for protection or to build a separate pumping post beside the closed well head protector casing in order to install the water meter and check valve.

As a result, it is possible to provide technology capable of considerably save labor force, time, and expense in the process of installing the closed well head protector casing.

Although exemplary embodiments of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

WHAT IS CLAIMED IS:

1. A closed well head protector apparatus for a groundwater well, comprising: a well head protector casing coupled to an outer casing installed at the ground well and provided with a feed port in order to sample groundwater; a lower disk ring welded to an inner circumferential surface of the well head protector casing; a fixed support placed on the lower disk ring and coupled to center a discharge port of a pumping pipe head with the feed port of the well head protector casing; and an advancing means moving the pumping pipe head forward and backward to couple the discharge port of the pumping pipe head to the feed port of the well head protector casing.

2. The closed well head protector apparatus as claimed in claim 1, wherein the advancing means includes: a worm gear connected to a rotational shaft; a worm wheel gear rotating in engagement with the worm gear; and a rotation cam rotatably fixed to the worm wheel gear and provided with an eccentric rotational shaft so as to move the pumping pipe head forward.

3. The closed well head protector apparatus as claimed in claim 1, wherein the advancing means includes: a worm gear connected to a rotational shaft; a worm wheel gear rotating in engagement with the worm gear; a pinion rotatably fixed to the worm wheel gear; and a rack fixed to the pumping pipe head and engaged with the pinion to move forward and backward by rotational force of the pinion.

4. The closed well head protector apparatus as claimed in claim 1, wherein the advancing means includes: a worm gear connected to a rotational shaft; a worm wheel gear rotating in engagement with the worm gear; a bolt bar rotatably fixed to the worm wheel gear; and a female threaded rod fixed to the pumping pipe head and screwed on the bolt bar to move forward and backward by rotational force of the bolt bar.

5. A closed well head protector apparatus for a groundwater well, comprising: a closed well head protector casing coupled to an outer casing of the groundwater well; a well cover receiving a discharge pipe connected with a pumping pipe inserted in the groundwater well and mounted in the closed well head protector casing to seal off the outer casing; a lower support having the well cover seated thereon; a hose feed pipe connected to the well cover; and a feed pipe pocket formed around the closed well head protector casing and having the hose feed pipe installed therein.

6. The closed well head protector apparatus as claimed in claim 5, wherein the well cover is coupled with a check valve and a water meter.

7. The closed well head protector apparatus as claimed in claim 5, wherein the feed pipe pocket has a tub structure of which one side is opened, and the hose feed pipe is received in the feed pipe pocket and has one end connected to the discharge pipe through a hose connector and the other end connected with a feed pipe socket.

8. The closed well head protector apparatus as claimed in claim 5, further comprising a heat-insulating material attached on an inner circumferential surface of the closed well head protector casing.

9. The closed well head protector apparatus as claimed in claim 5, wherein the discharge pipe is installed with a drain cock.

10. The closed well head protector apparatus as claimed in claim 5, wherein the feed pipe pocket is formed with a clamping step that allows a hose connector of the hose feed pipe to be located in the feed pipe pocket.