WO2011059172A2

WO2011059172A2 - Equipment for improving the efficiency of solar photovoltaic equipment

Info

Publication number: WO2011059172A2
Application number: PCT/KR2010/006263
Authority: WO
Inventors: 유상필
Original assignee: (주)하이레벤
Priority date: 2009-11-10
Filing date: 2010-09-14
Publication date: 2011-05-19
Also published as: KR100954530B1; WO2011059172A3

Abstract

The present invention relates to equipment for improving the efficiency of solar photovoltaic equipment. In the equipment for improving the efficiency of solar photovoltaic equipment according to the present invention, solar photovoltaic equipment comprising a plurality of solar modules is divided into a plurality of sectors, and cooling water is sprayed separately for each sector, the cooling water being sprayed while a cooling-water-spraying means rotates backwards and forwards, thereby making more efficient use of water resources but nevertheless also making it possible to improve cooling and cleaning efficiency by spraying an impinging jet of cooling water with adequate water pressure.

Description

Efficiency Improvement Facility of Photovoltaic Power Generation Facilities

The present invention relates to a facility for improving efficiency of a photovoltaic power generation facility, and more particularly, to an efficiency improvement facility for a photovoltaic power generation facility having an excellent cooling and washing effect while efficiently utilizing a limited water resource.

Generally, the method of using solar energy is largely divided into a method using solar heat and a method using solar light. The method of using solar heat is to heat and generate electricity using water heated by the sun, and the method of using solar light can generate electricity by using the light of the sun to operate various machines and appliances. It is called solar power.

In the above-described method, the photovoltaic effect in which photovoltaic power generation is caused by electron-hole electromotive force generated by light energy when irradiating sunlight to a pn junction photovoltaic panel with n-type doping on a silicon crystal. Generate electricity using

To this end, a solar cell for condensing sunlight, a photovoltaic module that is an assembly of solar cells, and a solar array in which the solar cells are constantly arranged are required.

For example, when light is incident on the solar module from the outside, electrons in the conduction band of the p-type semiconductor are excited to the valence band by the incident light energy. One electron-hole pair (EHP) is formed inside the p-type semiconductor, and electrons in the electron-hole pair generated are transferred to the n-type semiconductor by an electric field existing between the pn junctions. It passes over and supplies current to the outside.

Meanwhile, the efficiency of the photovoltaic module used in the photovoltaic power generation system is the most important factor that determines the economic feasibility of photovoltaic power generation in the range of about 16-18% of polycrystalline silicon material which is currently mainstream. In order to continuously improve such power generation efficiency, maintenance and repair through various devices are essential.

However, since solar cells, photovoltaic modules, and photovoltaic arrays for condensing sunlight are installed outdoors, they are exposed to the outside environment, causing scattering dust, algae secretions, yellow dust, and other contaminants to be deposited. The power generation efficiency is lowered. In particular, in winter, snow accumulates on solar cells, photovoltaic modules, and photovoltaic arrays, reducing the amount of condensing as if foreign matter is attached. In addition, the temperature is increased by prolonged exposure to sunlight, thereby reducing the electromotive force, thereby lowering the power generation efficiency.

Therefore, in order to solve such a problem, an efficiency improving device of a photovoltaic power generation facility is recently used. Such an efficiency improving device is a method of cleaning a solar panel with a mechanical driving force such as a brush of a vehicle, and a water hose on the upper part of the solar panel. By connecting the water flowing through the solar panel washing method, and a separate water jet type to wash the solar panel by spraying water at a strong pressure through a separate nozzle.

The method of using the brush has to make a separate brush suitable for maintaining the photovoltaic facility, and when the solar panel is overheated, it does not provide a special way to cool it, and water by gravity through the water hose Flowing method has the disadvantage that it does not have a great effect on dirt removal or snow removal. Therefore, in recent years, the use of a water jet type to cool and wash the solar panel by spraying the cooling water having a hydraulic pressure through the nozzle has been attempted.

Since the efficiency of the apparatus is generally fixed to the spray nozzle portion for spraying water, and the rotation is not adjustable, when the area of the photovoltaic array is large, a large number of nozzles are required, so that the water pressure required for cooling and cleaning is increased. Maintenance requires expensive equipment and running costs. In addition, when randomly spraying with a fixed type of nozzle, it is difficult to spray on a desired area, resulting in a waste of a large amount of water resources. In addition, shadows are often generated on the photovoltaic array by a pipe for adjusting the spray angle of the nozzle, and thus, a decrease in photovoltaic efficiency is generated or a distance between the photovoltaic arrays is increased, thereby requiring an additional area. Some shadows on photovoltaic modules must be avoided by causing a hot spot effect that can cause the output of series-connected solar cells to drop out of the module.

In particular, in the case of a large-scale photovoltaic array, the number of nozzles for cooling and washing increases in proportion to this, so that limited water resources are injected by spraying water toward the photovoltaic module at an appropriate water pressure without dropping the space spatially. There is a challenge to obtain sufficient cooling and cleaning efficiency while using efficiently.

Therefore, the present invention has been invented to solve such a problem, the photovoltaic power generation equipment consisting of a plurality of solar modules divided into a plurality of sectors and spraying the coolant for each sector, the coolant spraying means reciprocating rotation to spray the coolant By doing so, it is an object of the present invention to provide a device for improving efficiency of a photovoltaic power plant that can improve the cooling and washing efficiency by spraying a collision jet of cooling water with sufficient water pressure while utilizing water resources more efficiently.

In order to achieve the above object, the present invention maintains or improves the efficiency of the photovoltaic power generation equipment by spraying a collision jet of cooling water to a photovoltaic power generation equipment composed of a plurality of solar modules to collect electricity to generate electricity An efficiency improving apparatus of a photovoltaic power generation facility, comprising: a storage tank for storing cooling water; Cooling water injection means is installed so as to correspond to each of the plurality of solar modules, spraying the jet of the coolant to the photovoltaic module while reciprocating rotation; Cooling water supply pipe for supplying the cooling water supplied from the storage tank to the cooling water injection means; A pump for pumping the cooling water stored in the storage tank and supplying the cooling water to the cooling water supply pipe; At least two valves for dividing the plurality of solar modules into two or more sectors and controlling opening and closing of the cooling water supply pipe connected to the injection means corresponding to the solar modules of each sector; And a controller for driving the pump and sequentially opening the two or more valves to supply cooling water to the photovoltaic module for each sector.

The efficiency improving apparatus of the solar power plant may further include a collecting unit for collecting used cooling water or rainwater.

The water collecting unit may include a drip tray collecting the cooling water used to be installed at the bottom of the solar module.

The water collecting unit may include a water collecting tank installed at a lower portion of the solar module to collect used cooling water.

The cooling water supply pipe is preferably embedded in the ground.

The cooling water has a flow rate of 30 m / s or more and a pressure of 1.6 kg / cm ² or more based on the inlet of the cooling water injection means.

The efficiency improving apparatus of the solar power generation facility may further include a functional material addition unit for supplying a functional material including a cleaning agent or a freeze protection agent to the cooling water.

The efficiency improvement facility may be applied to both the tracked photovoltaic power generation facility and the stationary solar power generation facility.

For example, the controller may determine whether it is a driving start time, drive the pump if the driving start time, and open and close the two or more valves sequentially for a predetermined time.

In addition, the controller determines, for example, whether the measured temperature difference between the temperature of the module and the coolant is greater than or equal to a set value of the difference between the temperature of the module and the coolant, and the measured temperature difference between the temperature of the module and the coolant is the temperature of the module. And if the temperature difference is greater than or equal to the set value of the coolant, the pump may be driven until it is less than that, and the two or more valves may be sequentially opened and closed.

The controller may measure the water pressure in the cooling water supply pipe and terminate the starting when the measured water pressure is less than the set minimum pressure or exceeds the maximum pressure.

The controller determines whether the rain sensor is on or off, and if it is determined that it is raining, the operation is terminated. If the coolant stored in the storage tank is greater than or equal to the set level, the controller terminates the operation if the temperature is less than the set level. It is judged whether or not the temperature is higher, and the start can be terminated if it is lower than the temperature.

The cooling water spraying means may include two or more cylindrical members having a different diameter and connected to each other in a cylindrical manner, the body extending in length as water is supplied from the pipe; And a spraying unit coupled to the body to reciprocate the water transferred from the body and spraying water into the solar module, wherein the spraying unit has a inlet and an outlet formed at both sides thereof so that water is introduced and discharged; A separation plate mounted inside the housing and having first and second flow holes formed therethrough in different directions so that water flowing through the inlet passes and components opposite to each other are formed; A rotation aberration rotatably mounted in the housing to reciprocate rotation in both directions by flow forces in different directions formed as water passes through the first flow hole or the second flow hole; A rotation opening / closing unit which reciprocates in both directions in association with the reciprocating rotation of the rotational aberration and alternately opens and closes the first and second flow holes; A link unit for interlocking the rotation aberration and the rotation opening / closing unit; And an injection unit disposed outside the housing and communicating with the internal space of the housing through the discharge port to inject water discharged from the housing, wherein the injection unit is coupled to the rotation opening / closing unit and It can rotate and spray water together.

The diameters of the cylindrical members are sequentially increased in order of joining from the injection side, and in order to prevent separation between the plurality of cylindrical members, a cap is formed at the top of the larger cylindrical member of the two cylindrical members to be joined. The first locking jaw may be disposed at a lower end of the cylindrical member having a small diameter.

It may further include an elastic member that is tightly coupled in the cap to maintain the airtightness between the cylindrical member and the cap.

The two cylindrical members to be coupled may further include a guide portion protruding on the inner surface of the large diameter cylindrical member and a groove corresponding to the guide portion on the outer surface of the small diameter cylindrical member.

The efficiency improving apparatus for photovoltaic power generation facilities according to the present invention divides a photovoltaic power generation facility composed of a plurality of solar modules into a plurality of sectors and sprays coolant for each sector, while the coolant spraying means reciprocally rotates the coolant. By spraying, it is possible to improve the cooling and washing efficiency by spraying the collision jet of the cooling water with sufficient water pressure while utilizing water resources more efficiently.

1 is a block diagram showing the efficiency improvement equipment of the photovoltaic power generation equipment according to an embodiment of the present invention.

Figure 2 is a block diagram showing the efficiency improvement equipment of the photovoltaic power generation equipment according to another embodiment of the present invention.

Figure 3 is a perspective view of the cooling water injection means according to an embodiment of the present invention.

4 and 5 is a schematic cross-sectional view showing the configuration of the body of the coolant injection means according to an embodiment of the present invention, Figure 4 shows a state in which the body is folded, Figure 5 is a body lengthened by applying water pressure Show the appearance.

6 is a perspective view of a sealing member included in the body of the coolant injection means and the cap in which the sealing member is coupled according to an embodiment of the present invention;

7 is a cross-sectional view of a sealing member taken along line II-II of FIG. 6 and a cap in which the sealing member is coupled.

8 is a view showing a hydraulic pressure transmission unit installed in the body of the coolant injection means according to an embodiment of the present invention.

Figure 9 is a perspective view schematically showing the shape of the injection portion of the cooling water injection means according to an embodiment of the present invention.

10 is an exploded perspective view schematically showing the configuration of the injection unit of the cooling water injection means according to an embodiment of the present invention.

11 is a cross-sectional view schematically showing the internal structure of the injection portion of the cooling water injection means according to an embodiment of the present invention.

12 is a perspective view schematically showing a connection relationship between the internal components of the injection unit of the cooling water injection means according to an embodiment of the present invention.

13 and 14 are perspective views schematically showing the structure of the rotation of the rotation aberration according to an embodiment of the present invention.

FIG. 15 is a bottom view schematically illustrating an opening and closing state of first and second flow holes according to an exemplary embodiment of the present invention. FIG.

Hereinafter, the same reference numerals will be described in detail with reference to the accompanying drawings, with reference to the same components preferred embodiments of the present invention. The terms or words used in the specification and claims are not to be construed as being limited to conventional or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical matters of the present invention.

The embodiments described in the specification and the configuration shown in the drawings are preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, various equivalents and modifications that can replace them at the time of the present application are There may be.

Referring to FIG. 1, solar modules 7 are listed, and efficiency improving facilities are installed as facilities for maintaining and managing the solar modules 7.

The photovoltaic module 7 is an assembly of a plurality of solar cells. When light enters the photovoltaic module 7 from the outside, the photovoltaic module 7 is housed by the light energy in which electrons of the conduction band of the p-type semiconductor are incident. The excited electrons are excited in a valence band, and the excited electrons form an electron hole pair (EHP) inside the p-type semiconductor, and the electrons in the electron-hole pair thus generated are interposed between the pn junctions. The existing electric field (electron field) is transferred to the n-type semiconductor to supply the current to the outside.

However, since the solar module 7 is installed outside to collect sunlight, it is exposed to the external environment as it is, and contaminants such as scattering dust, algae secretions, and yellow sand are attached, thereby reducing the amount of collected light, thereby reducing power generation efficiency. Done. In addition, by being continuously exposed to sunlight and heated by solar heat, the internal resistance of the photovoltaic module is increased, which is also a factor for lowering the power generation efficiency.

The present invention relates to a facility that can maintain and improve the efficiency of photovoltaic power generation by cooling and washing the photovoltaic module (7).

Efficiency improvement equipment of the photovoltaic power generation equipment according to an embodiment of the present invention is a storage tank (1), cooling water injection means (6), cooling water supply pipe (5), pump 25, valves (21, 22, 23, 24) ) And the control unit 3.

Cooling water injection means (6) is installed to correspond to each of the solar modules (7) is a means for injecting the cooling water to spray the cooling water to the solar module (7). When cooling water is poured into the solar module 7 or sprayed weakly, it is difficult to obtain sufficient cooling and cleaning effects. In the present invention, the impingement jet of cooling water is sprayed on the solar module 7. The impingement jet has excellent heat transfer and mass transfer effects from the fluid to the impingement surface, thereby improving cooling and cleaning effects. However, in order to generate a collision jet, the speed of the cooling water is preferably 30 m / s or more and the pressure is 1.6 kg / cm ² or more based on the inlet of the cooling water injection means for injecting the cooling water into the solar module 7. Here, the inlet of the coolant jetting means refers to the end of the coolant jetting means in which the coolant is injected to the outside.

The cooling water spraying means 6 according to the present embodiment is fixed so that the cooling water is evenly sprayed on the front surface of the solar module 7 while reciprocating left and right, instead of spraying the cooling water only in one direction.

If the cooling water injection means 6 is fixed to spray the cooling water to the front of the photovoltaic module 7, the amount of water that can be used is limited, so the water pressure is not easy to generate a collision jet on the front of the photovoltaic module. However, as in the present embodiment, when the coolant injection means 6 reciprocates to the left and right, spraying the coolant only on a part of the photovoltaic module 7 may increase the water pressure of the coolant to easily generate a collision jet. Cooling and washing efficiency can be improved.

Cooling water injection means 6 may have a variety of configurations for injecting the cooling water while reciprocating rotation to the left and right, one exemplary configuration will be described later.

The cooling water supply pipe 5 receives the cooling water from the storage tank 1 and supplies the cooling water to the cooling water injection means 6, and a pump 25 is provided to pump the cooling water of the storage tank 1. The cooling water supply pipe 5 is preferably embedded in the ground to maintain the temperature of the cooling water.

The cooling water supply pipe 5 may be arranged in various forms in consideration of the terrain, and the plurality of solar modules 7 may be divided into two or more sectors, and the cooling water may be supplied for each injection means corresponding to the solar modules of each sector. It is desirable to be arranged so that it is separated into several branches. Branches of the cooling water supply pipe may also be configured in various ways without limitation. For example, as shown in FIG. 1, the cooling water supply pipes 6 may be arranged by dividing each sector horizontally, as well as FIG. 2. Cooling water supply pipes 6 may be arranged by dividing each sector vertically and horizontally as shown in FIG.

Valves

21, 22, 23, and 24 are installed in the cooling water supply pipe 6 to control opening and closing of the cooling water supply pipe 5, and for each branch according to opening and closing of the

valves

21, 22, 23, and 24. Cooling water supply and shut off are controlled.

The controller 3 is a part for controlling the pump 25 and the

valves

21, 22, 23, and 24. The controller 3 drives or stops the pump 25, and opens or closes the

valves

21, 22, 23, and 24. Let's do it. In opening the

valves

21, 22, 23, 24, the two or

more valves

21, 22, 23, 24 are sequentially opened so that the cooling water is supplied to each sector. Through this, the cooling water can be injected to the solar module 7 with sufficient water pressure even with a limited amount of cooling water to improve the cooling and washing efficiency by the collision jet.

The manner in which the control unit 3 controls the pump 25 and the

valves

21, 22, 23, and 24 is not particularly limited, but is preferably designed to maximize the use efficiency of the cooling water. An example of a control method for improving the use efficiency of the cooling water will be described.

The first example is time-based control. Specifically, the control unit 3 determines whether the drive start time, drives the pump 25 if the drive start time, and opens and closes two or more valves (21, 22, 23, 24) sequentially for a set time. . It is possible to set the start time of the driving and the opening times of the

valves

21, 22, 23, 24 in consideration of the region where the solar power generation facility is installed and the characteristics of the facility.

Another example is temperature control. Specifically, it is determined whether the measured temperature difference between the temperature of the module 7 and the cooling water is equal to or greater than the set temperature difference between the temperature of the module 7 and the cooling water, and the measured temperature difference between the temperature of the module 7 and the cooling water is determined. If the temperature difference between the temperature of the module 7 and the cooling water is greater than or equal to the set value, the pump 25 is driven and the two or

more valves

21, 22, 23, and 24 are sequentially opened and closed until the temperature is less than the set value. The temperature difference setting value of the temperature of the module 7 and the cooling water may be set in consideration of the region where the solar power generation facility is installed and the characteristics of the facility.

Whatever control method is selected, it is preferable to measure the pressure in the cooling water supply pipe 5 and to terminate the start of the efficiency improving apparatus when the pressure is out of a predetermined pressure range. If the measured pressure exceeds the maximum value of the set pressure range, a problem such as freezing of the coolant occurs in the coolant supply pipe 5, and if the measured pressure does not reach the minimum value of the set pressure range, the coolant supply pipe Since there is no problem such as leakage of water in (5), start-up is stopped to prevent the failure of the equipment and to efficiently use the cooling water.

In addition, when it is determined that the rain sensor 43 is on or off and is determined to be raining, the start-up is terminated. It is possible to judge whether the temperature of 7) is higher than the temperature of the cooling water, and even if the temperature is lower than the temperature of the cooling water, the start of the equipment can be stopped to prevent the failure of the equipment and the use of the cooling water can be more efficient.

In order to control the pump 25 and the

valves

21, 22, 23, and 24 as described above, the control unit 3 receives various sensing information from the sensing unit 4. In the sensing unit 4, the control unit 3 includes a timer 41, a pressure sensor 42, a rain sensor 43, a water level sensor 44, a first temperature sensor (temperature measurement of the module) 45, and a second unit. A temperature sensor (measurement of coolant temperature) 46 may be provided.

On the other hand, the efficiency improving apparatus according to the present embodiment may further include a collecting unit for collecting the cooling water used for reuse. The water collecting unit may be installed in the form of a drip tray so as to be installed at the bottom of the solar module to collect the cooling water, and may also be installed in the form of a water collecting tank to collect the coolant falling from the module on the ground below the solar module. have.

Also, the functional material addition unit may be connected to the cooling water supply pipe or the storage tank. As a functional material, a cleaning agent or a freezing agent may be added to improve washing efficiency and prevent freezing of the cooling water supply pipe.

The photovoltaic power generation system includes a fixed photovoltaic power generation facility having a light collecting plate fixed thereto, and a tracking photovoltaic power generation facility which tracks sunlight by changing the position or angle of the light collecting plate at a predetermined time. It can be applied to both solar and tracked solar power plants.

Hereinafter, an exemplary configuration of the coolant injection means used in the efficiency improving apparatus of the present invention will be described.

3 is a perspective view showing the coolant injection means 6 according to an embodiment of the present invention. As shown in FIG. 3, the cooling water jetting means 6 according to the present embodiment includes a body 61 and two or more cylindrical members having a diameter different from each other. It is coupled to and includes a spraying portion 62 for reciprocating the cooling water transmitted from the body to spray to the solar module.

Since the cooling water injection means 6 according to the present embodiment has a long length only during operation, it is possible to prevent the efficiency of the photovoltaic power generation equipment from being lowered due to shadows, and the nozzles are reciprocally rotated through a mechanical circulation mechanism so that the solar module has a large area. Coolant can be sprayed on.

4 and 5 is a schematic cross-sectional view showing the configuration of the body of the coolant injection means 6 according to the present embodiment, Figure 4 shows a state that the body is folded, Figure 5 is a body lengthened by applying water pressure Show the appearance. 4 and 5 show a body including two cylindrical members, the number of cylindrical members can be appropriately adjusted as needed.

6 is a perspective view of a sealing member included in the body of the coolant injection means 6 and the cap in which the sealing member is coupled according to the present embodiment, and FIG. 7 is a sealing member taken along the line II-II of FIG. Sectional view of the cap with sealing members engaged.

As illustrated in FIG. 4, the body 61 may supply a cooling water to the second cylindrical member 82 by connecting a pipe for supplying cooling water to the pipe connection 87.

4 to 7, the body 61 of the coolant injection means 6 according to the present embodiment is coupled to each other so as to extend in a cylindrical manner and has first and second cylindrical members 10A and 10B having different diameters. ), A cap 85 coupled to the top of the second cylindrical member 82, and an elastic member 86 coupled within the cap 85.

The cylindrical member is disposed at the top and has a first cylindrical member 81 having a minimum diameter, and a second cylindrical member having a diameter larger than that of the first cylindrical member 81, which is tightly connected below the first cylindrical member 81. And (82). The first cylindrical member 81 is connected to the inlet 121 of the injector housing, the second cylindrical member 82 is connected to the pipe.

The interior of each cylindrical member is formed in the form of an empty tube so that coolant can be supplied therein.

The first cylindrical member 81 is rigidly coupled to the second cylindrical member 82 thereunder, and thus is flexible.

A nozzle is connected to an upper end of the first cylindrical member 81 so that the coolant supplied from the inside of the second cylindrical member 82 may be sprayed onto the solar panel.

The cap 85 prevents the first cylindrical member 81 from leaving the second cylindrical member 82 when the first cylindrical member 81 extends from the second cylindrical member 82.

More specifically, as shown in FIGS. 4, 6, and 7, the cap 85 is composed of an upper portion 93 having a smaller diameter and a lower portion 94 having a larger diameter than the upper portion 93. The first locking jaw 83 is formed at the lower end of the first cylindrical member 81 to be held by the upper bottom surface of the cap when extending from the first cylindrical member 82, thereby preventing departure from the outside.

The elastic member 86 is provided to increase the airtightness between the cap 85 and the cylindrical member 10. That is, when the cylindrical member 10 is extended to the outside by the hydraulic pressure of the cooling water supplied to the inside, it is possible to prevent the coolant supplied in the cylindrical member 10 from leaking to the outside.

The stretchable member 86 may be formed of rubber, soft plastic, or other material capable of increasing airtightness.

More specifically, the elastic member 86 is formed so as to penetrate the inside thereof, a part is coupled so as to be in close contact with the upper portion 93 of the cap 85 and the other portion is in the bottom surface of the upper portion 93 of the cap 85 It can be combined to be in close contact.

The inner surface of the second cylindrical member 82 is further provided with a guide portion 91 to allow the first cylindrical member 81 to extend without rotating left and right by water pressure when supplying coolant into the second cylindrical member 82. It may include.

For example, as shown in FIGS. 4 and 5, the guide portion 91 protrudes in the second cylindrical member 82, and correspondingly, the first cylindrical member 81 may be grooved.

Therefore, when the cylindrical member 10 is extended, the guide portion 91 and the groove may be engaged with each other, thereby preventing the cylindrical member 10 from rotating left and right.

In the present exemplary embodiment, the guide portion 91 is formed on the inner surface of the second cylindrical member 82 and the groove is formed to correspond to the guide portion 91 on the outside of the first cylindrical member 81. The present invention is not limited thereto, and the guide portion 91 may protrude on the outer surface of the first cylindrical member 81, and a groove may be formed on the inner surface of the second cylindrical member 82 to correspond to the guide portion 91. .

In addition, the shape of the guide portion 91 and the corresponding groove may have a rectangular cross section as shown in the drawing, but the present invention is not limited thereto and prevents left and right rotation of the first cylindrical member 81 and smoothly. Any configuration can be taken as long as the extension of the first cylindrical member 81 is guided.

According to the present embodiment, the body 61 may further include an elastic member 89 such as a spring on the outside of the first cylindrical member 81.

The elastic member 89 is positioned between the outer surface of the first cylindrical member 81 and the inner surface of the second cylindrical member 82 and formed on the upper bottom surface of the cap 85 and the lower end of the first cylindrical member 81. It is disposed between the two locking jaw (84).

In this way, the elastic member 89 is attached to the second locking jaw 84 formed at the lower end of the first cylindrical member 10 when the first cylindrical member 81 is extended to the outside by the hydraulic pressure of the coolant supplied therein. When it is held and contracted against the bottom surface of the upper portion 93 of the cap 85 and the supply of the cooling water is cut off and the water pressure is weakened, the elastic force of the elastic member 89 acts to open the first cylindrical member 81. Restores the original position.

8 is a view showing a hydraulic pressure transmission unit installed in the body 61 of the coolant injection means 6 according to the present embodiment.

Body 61 according to an embodiment of the present invention may further include a hydraulic transmission unit 90 in the lower portion of the first cylindrical member 81 in order to more easily extend the first cylindrical member by the hydraulic pressure. .

The lower surface of the hydraulic pressure transmission unit 90 is blocked so that when the cooling water is supplied to the body 61 from the pipe, the lower surface immediately receives the hydraulic pressure so that the first cylindrical member 81 may be extended immediately upon supply of the cooling water.

Since the lower surface of the hydraulic pressure transmission unit 90 is blocked, the cooling water supplied from the pipe is supplied to the first cylindrical member 81 through the side surface of the hydraulic pressure transmission unit 90. The side surface of the hydraulic pressure transmission unit 90 may be drilled in the form of a mesh to prevent dirt from flowing into the first cylindrical valve.

Hereinafter, an example of the operation of the body 61 of the coolant injection means 6 according to the present embodiment will be described in detail with reference to FIGS. 4 and 5.

4 and 5 are perspective views showing the folded and unfolded state of the body 61 of the coolant injection means 6 according to the present embodiment, respectively.

First, the body 61 is maintained in a contracted state as shown in FIG. 3 before the cooling water is supplied through the pipe.

Specifically, before the cooling water is supplied, the hydraulic pressure does not work, and thus the elastic force of the elastic member 89 provided outside the first cylindrical member 81 is applied, so that the elastic member 89 is lower than the first cylindrical member 81. Pushing down the second locking step 84 formed in the body 61 is maintained in a contracted state.

If the coolant is supplied into the body 61 through the pipe, the hydraulic pressure acts upward, and when the force pushing the first cylindrical member 81 upward by the hydraulic pressure is greater than or equal to the elastic force of the elastic member 50, the cylindrical member ( 10) extends upward as shown in FIG.

In solar power generation, the solar panels are connected in series, so if any shadow is generated on the solar panels, the efficiency is drastically lowered. However, the manufacturing efficiency of the photovoltaic power generation can be greatly improved by manufacturing the body 61 in a foldable manner that can be folded and unfolded as in the present invention.

9 is a perspective view schematically showing the shape of the jetting part of the coolant jetting means 6 according to the present embodiment, and FIG. 10 is an exploded view schematically showing the configuration of the jetting part of the coolant jetting means 6 according to the present embodiment. 11 is a sectional view schematically showing the internal structure of the jetting part of the coolant jetting means 6 according to the present embodiment, and FIG. 12 is an internal component of the jetting part of the coolant jetting means 6 according to the present embodiment. 13 and 14 are perspective views schematically showing the structure of the rotation of the aberration according to an embodiment of the present invention, Figure 15 is a perspective view according to an embodiment of the present invention A bottom view schematically showing the opening and closing states of the first and second flow holes.

The injection part 62 of the cooling water injection means 6 according to the present embodiment is a device for cleaning the solar panel by injecting a fluid, such as cooling water, as shown in FIG. 9 through a separate water supply facility (not shown). It comprises a housing 100 receives the fluid, and the injection unit 600 mounted to the outside of the housing 100, the injection unit 600 for injecting fluid through a mechanical mechanism without a separate electric power It is configured to be rotatable.

The injection unit is a component for enabling the injection unit 600 to be rotatable as shown in FIGS. 10 and 11. The separating diaphragm 200, the rotation aberration 300, and the rotation opening / closing unit 400 inside the housing 100. And a link unit 500 are mounted.

The housing 100 has an inlet 121 and an outlet 111 formed at both sides in the longitudinal direction so that an accommodation space is formed therein and fluid flows into and discharges from the interior space. The shape of the housing 100 is formed in a hollow cylindrical shape in which both sides are closed, and a separate cylindrical support barrel 130 may be provided inside the housing 100 so that the above components can be stably mounted. The support barrel 130 has a fixed support shaft 131 is formed to rotatably mount the rotation aberration 300 and the opening and closing clutch unit 430 to be described later, the separation plate 200 is formed on the fixed support shaft 131 It can be fixedly mounted. The support barrel 130 is fixedly coupled to one side inner surface of the housing 100 in communication with the inlet 121 to be configured to allow the fluid introduced into the inlet 121 to pass through the interior of the support barrel 130. Can be. However, the support barrel 130 is according to an embodiment of the present invention, and may be configured in such a manner that the fixed support shaft 131 is formed on the inner surface of the housing 100 without the support barrel 130. On the other hand, the housing 100 is coupled to the open body of the housing body 110 and the housing body 110, the outlet 111 is formed on one side of the hollow cylindrical shape of which one surface is open, the housing body 110 and the inlet 121 It may be formed separated into the housing cover 120 is formed.

The separating plate 200 may be formed in a circular plate shape to be coupled to the inside of the housing 100 in the transverse direction. The first and second flow holes 210 and 220 having flow paths in different directions so that the fluid flowing into the housing 100 through the inlet 121 pass through the separation plate 200 and the flow direction components in opposite directions are formed. ) Is formed through. That is, the first and second flow holes 210 and 220 are formed such that a direction component, for example, an X direction component and a -X direction component, in which the flow directions of the fluid passing therethrough are opposite to each other, is generated. It will be described later.

The rotation aberration 300 is formed in a shape in which a plurality of rotating blades 310 are spaced at equal intervals along the circumferential direction, and the central axis C is inserted into the coupling groove 415 formed in the fixed support shaft 131. And rotatably coupled to each other and disposed adjacent to one side of the separating diaphragm 200 to be rotated by the flow force of the fluid passing through the first and second flow holes 210 and 220 of the separating diaphragm 200. Is configured to. The flow direction of the fluid passing through the first and second flow holes 210 and 220 has components opposite to each other as described above, in which the first and second flow holes 210 and 220 are described below. The rotation aberration 300 is reciprocally rotated in both directions by the flow force of the fluid having the components in the opposite direction passed through the first flow hole 210 or the second flow hole 220 so as to be alternately opened and closed by.

The rotation opening / closing unit 400 is rotatably mounted in the housing 100 to reciprocally rotate in conjunction with the reciprocating rotation of the rotation aberration 300, and alternately alternately rotate the first and second flow holes 210 and 220 according to the rotation. It is configured to open and close. The rotation opening and closing unit 400 is interlocked with the rotary aberration 300 by a separate link unit 500, the link unit 500 is a variety of ways through a variety of power transmission mechanical elements, such as a plurality of link plates, chains, belts The link unit 500 according to an embodiment of the present invention may be configured by using a plurality of gears as shown in FIGS. 10 and 11.

On the other hand, the injection unit 600 is disposed on the outside of the housing 100 and communicates with the interior space of the housing 100 through the discharge port 111 is configured to inject the fluid discharged from the housing 100. In addition, the injection unit 600 is coupled to the rotation opening and closing unit 400 inside the housing 100 rotates integrally with the rotation opening and closing unit 400 and injects fluid. Therefore, since the injection unit 600 rotates and injects the fluid, the fluid is evenly injected to the entire area of the solar panel.

According to such a structure, the washing apparatus of the solar power plant according to the embodiment of the present invention is supplied with a fluid and the rotation aberration 300 by the flow force of the fluid alternately passed through the first and second flow holes (210, 220) Is reciprocatingly rotated and thus the injection unit 600 rotates to inject fluid. Therefore, the injection unit 600 is configured to be rotatable through a mechanical mechanism without using an additional electric power, so that the energy efficiency is excellent and the structure can perform the washing function of the solar panel having a relatively large size.

Next, a more detailed look at the mechanism in which the injection unit 600 according to an embodiment of the present invention rotates in both directions.

As described above, the separating diaphragm 200 is fixedly mounted to the inside of the housing 100 in a flat shape as described above, and the first and second flow holes 210 and 220 are formed in the separating diaphragm 200. At least one first and second flow holes 210 and 220 are each formed to have a straight flow path formed to be inclined with respect to the thickness direction of the separation plate 200, and at least one first and second flow holes 210 and 220 are inclined directions of the first and second flow holes 210 and 220. Silver may be formed symmetrically with respect to the thickness direction of the separation plate 200. For example, the first flow hole 210 is inclined to form a fluid flow force for rotating the rotation aberration 300 in a counterclockwise direction with reference to FIG. 13, and the second flow hole 220 is formed in the rotation aberration ( It may be inclined to form a fluid flow force for rotating the clockwise 300. Accordingly, the fluid passing through the first flow hole 210 forms a flow direction component in the inclined direction of the first flow hole 210 to rotate the rotation aberration 300 counterclockwise, and the second flow hole ( The fluid having passed through 220 forms a flow direction component along the inclined direction of the first flow hole 210 and the second flow hole 220 which are symmetrical with each other to rotate the rotation aberration 300 in a clockwise direction. At this time, the first and second flow holes (210, 220) are each other along the circumferential direction to the separation diaphragm 200, as shown in Figures 7 to 15 to enhance the fluid flow force for rotating the rotary aberration (300) Each of the first and second flow holes 210 and 220 may be formed in alternating positions along the circumferential direction. Dogs and so on will be variously modifiable.

On the other hand, the rotation opening and closing unit 400 is reciprocating in both directions in conjunction with the reciprocating rotation of the rotary aberration 300 and alternately open and close the first and second flow holes (210, 220). Accordingly, the first and second flow holes 210 and 220 are alternately opened and closed by the reciprocating rotation of the rotary opening and closing unit 400, and the fluid flow passing therethrough is alternately opened and closed. The power has components opposite to each other, so that the rotation aberration 300 reciprocates, and the reciprocation of the rotation aberration 300 again generates a circulation mechanism for reciprocating the rotation opening and closing unit 400. By this circulation mechanism, the reciprocating rotation of the rotary aberration 300 and the rotary opening / closing unit 400 is continuously repeated as long as fluid is supplied into the housing 100.

Looking at the configuration of the rotation opening and closing unit 400 in more detail, the rotation opening and closing unit 400 is directly connected and coupled to the link unit 500 according to an embodiment of the present invention to rotate in conjunction with the rotation aberration 300 The rotary block unit 410 and the rotary block unit 410 are engaged with the rotary block unit 410 to rotate integrally with the rotary block unit 410 and to the separation plate 200 to open and close the first and second flow holes 210 and 220 alternately. It is configured to include an opening and closing clutch portion 430 is contacted.

At this time, the rotary block 410 is connected to the link unit 500 in accordance with an embodiment of the present invention so as to communicate with the circular rotary plate 411, the through-hole 416 formed in the center portion, the through-hole 416 A connecting sleeve 412 protruding from one surface of the rotating plate 411 to be coupled to the injection unit 600 and the outer side of the rotating plate 411 to be engaged with the opening / closing clutch unit 430 along the longitudinal direction of the housing 100. It may be configured to include an extended formed locking bar 413, the rotating plate 411, the connecting sleeve 412 and the locking bar 413 is preferably formed integrally, but each formed separately and coupled to each other It can also be produced. At this time, the connecting sleeve 412 is configured to be detachably coupled to the injection unit 600, the detachable coupling method may be applied to the screw coupling method as shown in Figure 9, in addition to the fitting method or separate It can be changed in various ways such as bolt fastening method.

In addition, the opening and closing clutch unit 430 is in contact with one side of the separating diaphragm 200 in accordance with an embodiment of the present invention so as to rotate integrally with the operating plate 431, the operating plate 431 It is coupled to engage the engaging bar 413 of the rotary block 410, and includes an operation locking plate 432 formed to protrude to the outside of the separation plate 200 to rotate, the operating plate 431 is rotated The first and second flow holes 210 and 220 may be configured to be opened and closed alternately, and the operating plate 431 and the operating stopping plate 432 may be integrally formed with each other. The opening / closing clutch unit 430 may be configured to further include an elastic spring 433 for elastically biasing the operating plate 431 such that the operating plate 431 rotates the lock portion 41 for closing the first flow hole 210. Can be.

Accordingly, the rotation opening / closing unit 400 is formed of the rotation block part 410 and the opening / closing clutch part 430 to be combined with the injection unit 600 to perform the function of rotating the injection unit 600 and the first and the same. A function of alternately opening and closing the second flow holes (210, 220).

When the operation state of the rotation opening and closing unit 400 is divided into the rotation block unit 410 and the opening / closing clutch unit 430 to examine in more detail, first, the rotation block unit 410 is rotated by the link unit 500 ( Rotate in conjunction with 300). More specifically, as shown in FIG. 12, when the rotary aberration 300 reciprocates, the circular rotary plate 411 and the connecting sleeve 412 which are directly coupled to the link unit 500 reciprocate, and thus The injection unit 600 coupled to the connecting sleeve 412 is reciprocated. In addition, when the connecting sleeve 412 reciprocally rotates, the catching bar 413 extending to the outer side of the connecting sleeve 412 is also reciprocally rotated. Since the engaging plate 432 is engaged, the operation stopping plate 432 is reciprocally rotated together with the locking bar 413. When the operation stopping plate 432 reciprocally rotates, the operation plate 431 integrally coupled thereto rotates reciprocally, and the first and second flow holes 210 and 220 alternately according to the reciprocating rotation of the operation plate 431. It is opened and closed. Selective opening and closing of the first and second flow holes 210 and 220 induces reciprocation of the rotation aberration 300 again as described above, and as a result, the rotation opening and closing unit 400 continuously reciprocates.

At this time, the locking bar 413 of the rotary block 410 and the operation locking plate 432 of the opening and closing clutch unit 430 may be formed to be engaged when both of the locking bar 413 rotates in both directions, as shown in FIG. As described above, the engagement bar 413 may be configured to be engaged only in one direction rotation and to be disengaged in the opposite direction. For example, as shown in FIG. 15A, in the state in which the operating plate 431 and the operating stopping plate 432 are rotated with the first flow hole 210 closed, the locking bar 413 is provided. When the rotation in one direction is engaged with the operation locking plate 432 is rotated so as to rotate the operating plate 431 to close the second flow hole 220 as shown in (b) of FIG. When the locking bar 413 rotates in the opposite direction while the operation plate 431 closes the second flow hole 220, in this case, the operation locking plate 432 is connected to the locking bar 413. Since the engagement plate 432 and the operation plate 431 do not rotate, the second flow hole 220 is kept closed because it is not engaged. Therefore, in this case, as shown in FIG. 10, the operating plate 431 is rotated to close the first flow hole 210 by a separate elastic spring 433 for elastically biasing the operating plate 431.

On the other hand, the rotation opening and closing unit 400 is to be reciprocated in accordance with the operation principle described above, such a rotation opening and closing unit 400 is a separate rotation stopper so that the reciprocating rotation angle can be adjusted according to an embodiment of the present invention ( 420 may be mounted. That is, as shown in FIG. 12, the rotary stopper 420 protruding outward from the rotary block 410 is coupled to the upper surface of the rotary plate 411 of the rotary block 410, and the inner circumferential surface of the housing 100. On one side, as the rotary stopper 420 rotates, a fixing protrusion 132 that may be engaged with the rotary stopper 420 may be formed. Therefore, the maximum rotation angle of the rotation block 410 is limited by the rotation stopper 420 and the fixing protrusion 132. In this case, the rotary stopper 420 may be coupled to the connection sleeve 412 through the coupling hole 421 to be penetrated, and the coupling protrusion 422 is formed on the inner circumferential surface of the coupling hole 421. And the outer circumferential surface of the connecting sleeve 412 is formed with a plurality of coupling grooves 415 which can be inserted into the coupling protrusion 422 spaced along the circumferential direction, by the coupling protrusion 422 and the coupling groove 415 The rotary stopper 420 may be detachably coupled to the rotary block 410. Therefore, the coupling position of the rotary stopper 420 is changed to have various relative positions with respect to the rotating plate 411 according to the position of the coupling groove 415 to which the coupling protrusion 422 is coupled among the plurality of coupling grooves 415, According to the change of the coupling position, the maximum rotation angle of the rotation block part 410 limited by the rotation stopper 420 is adjusted.

Next, looking at the link unit 500 for interlocking the rotary opening and closing unit 400 and the rotary aberration 300 in more detail, the hollow cylinder in which the teeth (G) of the gear is formed on the inner peripheral surface of the rotary opening and closing unit 400 Gear teeth 414 are formed, the link unit 500 may be configured to include a plurality of gears that are engaged to the rotation opening and closing unit 400. That is, the link unit 500 is coupled to the central axis C of the rotational aberration 300, the driving gear 510 rotates, and the reduction gear is engaged with the driving gear 510 and transmits the rotational force of the driving gear 510. It may be configured to include a gear unit 520 and a driven gear 530 that is meshed with the reduction gear unit 520 to which the rotational force of the driving gear 510 is transmitted. At this time, the driven gear 530 is mounted to mesh with the gear teeth 414 of the rotation opening and closing unit 400. Therefore, when the rotation aberration 300 rotates, the driving gear 510 coupled to the central axis C of the rotation aberration 300 rotates, and the reduction gear unit 520 according to the rotation of the driving gear 510. ) And the driven gear 530 is rotated accordingly the rotation opening and closing unit 400 is rotated. At this time, the reduction gear unit 520 may be configured through a plurality of compound gears 521 so that the rotational speed of the drive gear 510 can be reduced, by the reduction gear unit 520 rotation opening and closing unit 400 It is preferable that the rotational speed of Rx is relatively slower than the rotational speed of the rotational aberration 300. In addition, the link unit 500 is engaged with the gear tooth 414 to support the rotation opening and closing unit 400 meshed with the driven gear 530 in accordance with one embodiment of the present invention (at least one idle gear ( It is preferably configured to further comprise 540.

The link unit 500 may be mounted through a separate gear box 550 provided inside the housing 100 as shown in FIGS. 10 to 12. The gear box 550 is separated into a hollow cylindrical gear box body 551 and a flat gear box cover 553 that closes one surface of the gear box body 551, and is formed inside the gear box body 551. The reduction gear unit 520 may be seated on the gear support 552, and the driven gear 530 and the idle gear 540 may be seated on an upper surface of the gear box cover 553.

On the other hand, the injection unit 600 may be configured in various ways to inject a fluid using the injection nozzle, the injection unit 600 according to an embodiment of the present invention is a rotation opening and closing unit ( It is detachably coupled to 400 and the injection case 610 is formed in the injection passage 611 is formed in communication with the interior of the housing 100 so that the fluid passes therein, and is detachably coupled to the outlet of the injection passage 611 It may be configured to include a spray nozzle (620). That is, the injection unit 600 may be detachably coupled to the connection sleeve 412 of the rotation opening and closing unit 400 as shown in FIG. 11, as described above, the connection sleeve 412 and the injection case 610. Screws corresponding to each other can be screwed in a way that is formed, through which the various types of injection unit 600 can be easily exchanged as necessary. In addition, the injection nozzle 620 may be detachably coupled to the injection flow path 611 as shown in Figure 9, this coupling method may be variously changed, such as bolt coupling method, screw coupling method According to this structure, various types of spray nozzles 620 may be easily combined and used.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

In the efficiency improvement facility of the solar power generation facility to maintain or improve the efficiency of the solar power generation facility by spraying the impingement jet of cooling water to the solar power generation facility consisting of a plurality of solar modules to collect electricity to generate electricity ,

A storage tank for storing coolant;

Cooling water injection means is installed so as to correspond to each of the plurality of solar modules, spraying a jet of the cooling water to the photovoltaic module while reciprocating rotation;

Cooling water supply pipe for supplying the cooling water supplied from the storage tank to the cooling water injection means;

A pump for pumping the cooling water stored in the storage tank and supplying the cooling water to the cooling water supply pipe;

At least two valves for dividing the plurality of solar modules into two or more sectors and controlling opening and closing of the cooling water supply pipe connected to the injection means corresponding to the solar modules of each sector; And

A controller for driving the pump and sequentially opening the two or more valves to supply cooling water to the solar module for each sector;

Efficiency improvement equipment of photovoltaic power generation equipment comprising a.
The method of claim 1,

Efficiency improvement equipment of the solar power plant, characterized in that it further comprises a collecting section for collecting the used coolant.
The method of claim 2,

The water collecting unit is installed at the bottom of the solar module efficiency improvement equipment of the solar power plant, characterized in that it comprises a drip tray for collecting the cooling water or rain water used.
The method of claim 2,

The water collecting unit is installed in the lower portion of the solar module, the efficiency improvement equipment of the solar power generation equipment, characterized in that it comprises a collecting tank for collecting the used coolant.
The method of claim 1,

The cooling water supply pipe is efficiency improvement equipment of the solar power plant, characterized in that buried underground.
The method of claim 1,

The cooling water sprayed from the cooling water spraying means to the solar module has a flow rate of 30 m / s or more and a pressure of 1.6 kg / cm 2 or more based on the inlet of the cooling water spraying means. .
The method of claim 1,

Further improving efficiency of the solar power plant, characterized in that it further comprises a functional material addition unit for supplying a functional material including a cleaning agent or freeze protection agent with cooling water.
The method of claim 1,

The solar power plant is an efficiency improvement system of the solar power plant, characterized in that the tracking or fixed.
The method of claim 1,

The control unit determines whether the drive start time, and if the drive start time, driving the pump, and the efficiency improvement equipment of the photovoltaic power generation facility, characterized in that for opening and closing the two or more valves sequentially set time.
The method of claim 1,

The controller determines whether the measured temperature difference between the temperature of the module and the coolant is greater than or equal to the set temperature difference between the temperature of the module and the coolant, and the measured temperature difference between the temperature of the module and the coolant differs between the temperature of the module and the coolant. If more than the set value, the efficiency of the photovoltaic power generation equipment characterized in that for driving the pump until it is less than that, and opening and closing the two or more valves in sequence.
The method of claim 9 or 10,

Measuring the water pressure in the cooling water supply pipe and if the measured water pressure is less than the set minimum pressure or exceeds the maximum pressure, the efficiency improvement equipment of the solar power plant, characterized in that the end.
The method of claim 11,

If it is determined that the rain sensor is on or off, it is determined that it is raining, and the start is terminated. If the coolant stored in the storage tank is above the set level, the start is finished. If the temperature is lower than the set level, the start is finished. The efficiency improvement equipment of the photovoltaic power generation equipment characterized in that the start of the determination is terminated when the temperature is below the determined temperature.
The method of claim 1,

The cooling water spraying means may include two or more cylindrical members having a different diameter and connected to each other in a cylindrical manner, the body extending in length as water is supplied from the pipe; And an injection unit coupled to the body for reciprocating the water transferred from the body and spraying the solar module.

The injection unit

A housing having inlets and outlets formed at both sides thereof so that water flows in and out;

A separation plate mounted inside the housing and having first and second flow holes formed therethrough in different directions so that water flowing through the inlet passes and components opposite to each other are formed;

A rotation aberration rotatably mounted in the housing to reciprocate rotation in both directions by flow forces in different directions formed as water passes through the first flow hole or the second flow hole;

A rotation opening / closing unit which reciprocates in both directions in association with the reciprocating rotation of the rotational aberration and alternately opens and closes the first and second flow holes;

A link unit for interlocking the rotation aberration and the rotation opening / closing unit; And

An injection unit disposed outside the housing and communicating with the internal space of the housing through the outlet to inject water discharged from the housing,

The injection unit is coupled to the rotation opening and closing unit to rotate with the rotation opening and closing unit, characterized in that for spraying water

Efficiency improvement equipment of photovoltaic power generation facilities.
The method of claim 13,

Diameters of the cylindrical members are sequentially increased in the order of coupling from the injection side,

In order to prevent separation between the plurality of cylindrical members, a cap is disposed at the upper end of the larger diameter cylindrical member of the two cylindrical members to be joined, and a first locking step is formed at the lower end of the cylindrical member having a smaller diameter. Efficiency improvement equipment of photovoltaic power plant.
The method of claim 14,

The efficiency improvement facility of the solar power generation equipment characterized in that it further comprises a stretchable member tightly coupled in the cap to maintain the airtightness between the cylindrical member and the cap.
The method of claim 15,

Improved efficiency of the photovoltaic power generation equipment characterized in that it further comprises a guide portion protruding on the inner surface of the larger cylindrical member of the two cylindrical members to be joined and grooves corresponding to the guide portion on the outer surface of the cylindrical member having a smaller diameter; equipment.