Multifunctional integrated photovoltaic box transformer

Abstract

The present application relates to the technical field of box-type substation, in particular to a multifunctional integrated photovoltaic box-type transformer, comprising a high-voltage box, a low-voltage box and an oil tank arranged on a base in sequence, two upper and lower distribution baffles are fixed in the oil tank, and an installation cavity, a clamping cavity and a temporary storage cavity are sequentially formed from top to bottom in the oil tank, a cylinder is fixed on the inner wall of one side of the temporary storage cavity, a corrugated cylinder is fixedly connected on the end edge of the cylinder, and a push plate is matched and installed in the temporary storage cavity; one end of the corrugated cylinder away from the cylinder is fixed with the push plate, so as to form a space-variable cavity in the cylinder and the corrugated cylinder, and the cylinder is connected with a second conduit in communication. The push plate is driven by a driving mechanism to translate along the extension direction of the corrugated cylinder, the volume of the cavity is dynamically adjusted, the closed temporary storage and backflow of the oil body in the installation cavity are realized, the external oil pumping equipment is not needed during the maintenance of the transformer parts, the maintenance downtime is significantly shortened, the operation complexity is reduced, the oil body is avoided from being exposed and polluted, and the maintenance safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of box-type substations, in particular to a multifunctional integrated photovoltaic box-type substation. BACKGROUND

[0002] The integrated photovoltaic box-type substation is a key equipment in a photovoltaic power generation system, and is also called a photovoltaic prefabricated substation. The high-voltage switching device, transformer, low-voltage power distribution device, etc. are combined together, and are compactly integrated in one or several boxes through optimized design, and have the characteristics of small land occupation, convenient installation, high protection level, strong reliability, etc. The photovoltaic box-type substation can convert the direct-current power generated by the photovoltaic array into alternating-current power through an inverter to meet the requirements of long-distance transmission and integration into the power grid, and has the functions of protection, control and monitoring of the circuit, and is widely used in centralized and distributed photovoltaic power generation projects.

[0003] The oil-immersed transformer in the photovoltaic box-type substation uses insulating oil as the cooling and insulating medium, and is sealed in a box filled with transformer oil. The heat is dissipated by the convection circulation of the oil, and the insulation performance and heat dissipation capacity are excellent. The core components such as the high-voltage winding and the low-voltage winding are immersed in the transformer oil, and are connected to the external circuit through the bushing, which can effectively reduce the risk of moisture and operating temperature of the winding, and has the advantages of strong overload capacity and long service life.

[0004] In the prior art, when the transformer components are maintained and repaired, in order to avoid the influence of the oil body on the operation and the pollution of the oil body, the oil body is usually discharged. The oil discharge process needs to be matched with external oil pumping equipment, which is time-consuming and laborious, and has low efficiency. In addition, when the oil body is replaced after a long time of use, the waste oil is usually collected by using an external oil tank. The oil tank is usually exposed, and a lot of debris will accumulate in it. After the waste oil enters, it increases the difficulty of recycling and reuse in the later period. SUMMARY

[0005] The purpose of the present application is to provide a multifunctional integrated photovoltaic box-type substation to solve the technical problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme.

[0007] A multifunctional integrated photovoltaic box-type substation, comprising a high-voltage box, a low-voltage box and an oil tank arranged in sequence on a base, two upper and lower distribution baffles are fixed in the oil tank, and an installation cavity, a clamping cavity and a temporary storage cavity are sequentially formed in the oil tank from top to bottom. A cylinder is fixed on the inner wall of one side of the temporary storage cavity, a corrugated cylinder is fixedly connected to the end edge of the cylinder, and a push plate is matched and installed in the temporary storage cavity.

[0008] The one end of the corrugated cylinder away from the cylinder body is fixed with a push plate, so that a space variable cavity is formed in the cylinder body and the corrugated cylinder, a second conduit is connected with the cylinder body, the second conduit passes through the clamping cavity and is communicated with the bottom of the installation cavity, a second electric valve is installed on the second conduit, a driving mechanism is arranged on the side of the oil tank, the driving mechanism is used for driving the push plate to translate along the extension and retraction direction of the corrugated cylinder, and a sampling mechanism is further arranged on the oil tank.

[0009] Preferably, the side of the oil tank away from the cylinder body is provided with an oil discharge pipe, the oil discharge pipe is communicated with the bottom of the temporary storage cavity, a cover is screwed on the end of the oil discharge pipe, a first conduit is arranged in the clamping cavity, the top of the first conduit is communicated with the partition plate, and the bottom of the first conduit is communicated with the temporary storage cavity; when the corrugated cylinder is retracted to the limit position, the communication position of the first conduit and the temporary storage cavity is located between the oil discharge pipe and the push plate, and a first electric valve is installed on the first conduit.

[0010] Preferably, the four side end faces of the push plate are respectively closely slidably attached to the inner walls of the corresponding sides of the temporary storage cavity.

[0011] Preferably, the driving mechanism comprises a fixed seat, an electric push cylinder, a connecting arm and a sliding rod, the electric push cylinder is fixed on the side of the oil tank through the fixed seat, the sliding rod is inserted and slid through the oil tank, and one end of the sliding rod extends into the temporary storage cavity and is fixed with the push plate; the end of the sliding rod outside the oil tank is fixed with the connecting arm, and the other end of the connecting arm is fixedly connected with the telescopic rod end of the electric push cylinder.

[0012] Preferably, the sampling mechanism comprises a sleeve, a hollow guide rod, a sampling cylinder, a traction rod and a spring, the sleeve is fixed on the top of the oil tank and extends through to the installation cavity, the hollow guide rod is inserted and slid through the sleeve, the traction rod is inserted and slid through the hollow guide rod, the bottom end of the traction rod is fixed with the sampling cylinder, and the top of the sampling cylinder is provided with sampling cavities distributed around the traction rod.

[0013] The top end of the traction rod is fixed with a tail handle, the outer portion of the hollow guide rod and above the sleeve is fixedly sleeved with a cover, the spring is sleeved outside the hollow guide rod and the traction rod, one end of the spring is fixed with the tail handle, and the other end of the spring is fixed with the cover; under the elastic restraint force of the spring, the top end of the sampling cylinder can be closely attached to the bottom end of the hollow guide rod, so that the sampling cavities are sealed.

[0014] Preferably, the top of the sleeve is provided with a slope surface which is higher closer to the hollow guide rod and the cross section of which is arc-shaped.

[0015] Preferably, the lower surface of the cover is provided with a concave surface which is matched with the slope surface, the concave surface can be closely attached to the slope surface, and a rubber pad is fixed on the concave surface.

[0016] Preferably, the oil tank top is fixed with a vertical upward extending fastening screw, the cover side is fixed with a fixing foot, the fixing foot is provided with a through hole for the fastening screw to pass through, and the fastening screw is further provided with a fastening nut.

[0017] Preferably, the sampling cylinder lower end is fixed with an anti-dropping disc, and the anti-dropping disc diameter is greater than the sleeve inner hole diameter.

[0018] Preferably, the base is provided with a protection basket on one side of the oil tank, the protection basket is internally installed with a radiator for cooling heat dissipation of the transformer, and a plurality of heat dissipation plates are arranged in the clamping cavity along the extension direction of the corrugated cylinder, the heat dissipation plates are horizontally inverted T-shaped and made of aluminum, one end of each heat dissipation plate extends into the installation cavity, and the other end extends to the outside of the oil tank and is connected with the radiator.

[0019] Compared with the prior art, the application has the following beneficial effects.

[0020] The push plate is driven to translate along the extension direction of the corrugated cylinder by the driving mechanism, the volume of the container cavity is dynamically adjusted, the closed temporary storage and backflow of the oil body in the installation cavity are realized, the external oil pumping equipment is not needed during the maintenance of the transformer parts, the maintenance downtime is significantly shortened, the operation complexity is reduced, the oil body is prevented from being exposed and contaminated, and the maintenance safety is improved.

[0021] When the corrugated cylinder is retracted to the limit position, the first guide pipe and the temporary storage cavity are communicated to form a directional oil discharge channel, the first electric valve is controlled to open and close, the waste oil is directly introduced into the external sealed container through the oil discharge pipe, the contact between the waste oil and external impurities during waste oil discharge is reduced, the waste oil pollution is avoided, the recovery process is simplified, and the subsequent waste oil recycling treatment difficulty is reduced;

[0022] Secondly, the push plate serves as both a sealing member of the container cavity and a waste oil cavity partition component, achieving two purposes at once.

[0023] When the oil body in the installation cavity flows into the waste oil cavity, the push plate is driven to move to the side of the oil discharge pipe by the driving mechanism, the oil body is pushed to move to the side of the oil discharge pipe, the oil body discharge is accelerated, and the oil body in the waste oil cavity is discharged as much as possible.

[0024] Since the hollow guide rod, the sampling cylinder and the traction rod have the up-down adjustable capacity relative to the sleeve, and the mechanism of blocking the sampling cavity by the spring elastic traction of the top end of the traction rod and the bottom end of the hollow guide rod after the oil body enters the sampling cavity, the oil body at different depths in the installation cavity can be collected, and the accuracy of the quality and quantity detection and evaluation of the oil body in the installation cavity is improved.

[0025] The heat dissipation plate can not only conduct the heat of oil to the radiator, but also serve as an internal support structure to enhance the strength of the box, and has the functions of support and auxiliary heat dissipation, optimizes the thermal management of the transformer, and enhances the system stability. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic view of the overall structure of the present application;

[0027] Figure 2 It is a schematic view of the oil tank in the present application;

[0028] Figure 3 It is a schematic view of the surface local structure of the oil tank in the present application;

[0029] Figure 4 It is a schematic view of the cross-sectional structure of the oil tank in the present application;

[0030] Figure 5 It is a schematic view of the cross-sectional structure of the oil tank in the present application;

[0031] Figure 6 It is a schematic view of the cross-sectional structure of the oil tank in the present application;

[0032] Figure 7 It is a schematic view of the internal local structure of the oil tank in the present application;

[0033] Figure 8 It is a schematic view of the installation of the corrugated cylinder structure in the present application;

[0034] Figure 9 It is a schematic view of the sampling mechanism structure in the present application;

[0035] Figure 10 It is Figure 9 an enlarged schematic view of the structure at A in the present application;

[0036] Figure 11 It is Figure 9 an enlarged schematic view of the structure at B in the present application;

[0037] Figure 12 It is Figure 10 an enlarged schematic view of the structure at C in the present application.

[0038] In the figure: 01, base; 02, high-pressure box; 03, low-pressure box; 04, protective basket; 05, radiator; 1, oil tank; 101, oil discharge pipe; 102, cover; 11, partition; 12, mounting cavity; 13, clamping cavity; 14, temporary storage cavity; 141, first conduit; 142, first electric valve; 15, heat sink; 2, push plate; 3, cylinder; 4, corrugated cylinder; 401, containing cavity; 41, second conduit; 42, second electric valve; 5, driving mechanism; 51, fixed seat; 52, electric push cylinder; 53, connecting arm; 54, sliding rod; 6, sampling mechanism; 61, sleeve; 611, inclined surface; 62, hollow guide rod; 63, sampling cylinder; 631, sampling cavity; 632, anti-dropping disc; 64, traction rod; 641, tail handle; 65, spring; 66, cover; 661, recessed surface; 67, fixed foot; 671, through hole; 68, fastening screw; 69, fastening nut. DETAILED DESCRIPTION

[0039] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0040] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection; can be direct connection, or can be indirect connection through intermediate medium. In addition, "communication" can be direct communication, or can be indirect communication through intermediate medium. Among them, "fixing" means connecting with each other and the relative positional relationship after connection does not change. The orientation language mentioned in the embodiments of the present application, such as "inner", "outer", "top", "bottom", etc., is only the direction of the drawing, therefore, the orientation language used is to better, more clearly illustrate and understand the embodiments of the present application, and is not indicative or implied that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0041] In the embodiments of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0042] In the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0043] Reference to "one embodiment" or "some embodiments" etc. in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment, although it can. The terms "comprising," "including," "having" and their variations, as used in this disclosure, mean "including but not limited to," unless expressly specified otherwise.

[0044] Embodiment 1

[0045] Referring to Figures 1-12 The application provides a multifunctional integrated photovoltaic box transformer, comprising a high-voltage box 02, a low-voltage box 03 and an oil tank 1 arranged on a base 01 in sequence, the high-voltage box 02, the low-voltage box 03 and the oil tank 1 are integrally welded and fixed to ensure the overall structural strength, two upper and lower distribution baffles 11 are fixed in the oil tank 1, and an installation cavity 12, a clamping cavity 13 and a temporary storage cavity 14 are sequentially formed in the oil tank 1 from top to bottom, wherein the transformer components are installed in the installation cavity 12, and the installation cavity 12 is filled with transformer oil to dissipate heat for the transformer components, in addition, the low-voltage box 03 has low-voltage modules and components, and the protective basket 04 has high-voltage modules and components, thereby forming a photovoltaic box transformer unit, and the specific photovoltaic transformer principle adopts the prior art, which will not be described in detail.

[0046] Referring to Figures 6-8 A cylinder 3 is fixed on the inner wall of one side of the temporary storage cavity 14, and a corrugated cylinder 4 is fixedly connected to the end edge of the cylinder 3, wherein the corrugated cylinder 4 has a structure similar to that of the corrugated pipe in the prior art and has the ability to stretch and deform.

[0047] A push plate 2 is matched and installed in the temporary storage cavity 14, and one end of the corrugated cylinder 4 away from the cylinder 3 is fixed with the push plate 2, so as to form a space-variable cavity 401 in the cylinder 3 and the corrugated cylinder 4, that is, the space of the cavity 401 can be changed by stretching and adjusting the corrugated cylinder 4, the second conduit 41 is connected in communication on the cylinder 3, the second conduit 41 passes through the clamping cavity 13 and is in communication with the bottom of the installation cavity 12, and the second electric valve 42 is installed on the second conduit 41, when the second electric valve 42 is adjusted to be in the open state, the oil in the baffle 11 can flow into the cavity 401 for temporary storage through the second conduit 41, and when the second electric valve 42 is adjusted to be in the closed state, the baffle 11 is not in communication with the cavity 401.

[0048] A driving mechanism 5 is arranged on the side of the oil tank 1, and the driving mechanism 5 can drive the push plate 2 to translate and adjust along the stretching direction of the corrugated cylinder 4.

[0049] Specifically, when the transformer components in the installation cavity 12 need to be maintained, in order to avoid the influence of the transformer oil on the operation and the pollution of the oil, the push plate 2 is driven by the driving mechanism 5 to move away from the barrel 3 until it is attached to the inner wall of the temporary storage cavity 14, and the corrugated barrel 4 is pulled to the limit position, at which time the space of the cavity 401 is expanded to the maximum state;

[0050] Then, the second electric valve 42 is adjusted to the open state, and the oil in the installation cavity 12 directly flows into the cavity 401 through the second conduit 41, realizing the temporary storage of the oil, facilitating the maintenance of the internal components of the installation cavity 12, and without the need to use additional equipment to transfer the oil to the outside;

[0051] When the maintenance is completed, the push plate 2 is driven by the driving mechanism 5 to move to the barrel 3 until it reaches the limit position, and the push plate 2 pushes the corrugated barrel 4 to retract to the limit state, and the temporarily stored oil is pressed back into the installation cavity 12 through the second conduit 41 as the space of the cavity 401 gradually decreases, and the second electric valve 42 is adjusted to the closed state, which can avoid the backflow of the oil and ensure the stability of the oil level in the installation cavity 12.

[0052] As shown in Figure 6 , the driving mechanism 5 includes a fixed seat 51, an electric push cylinder 52, a connecting arm 53, and a sliding rod 54. The electric push cylinder 52 is fixed to the side of the oil tank 1 through the fixed seat 51, the sliding rod 54 is inserted and fixed on the oil tank 1 in a through sliding manner, one end of the sliding rod 54 extends into the temporary storage cavity 14 and is fixed with the push plate 2, and the other end of the sliding rod 54 is fixed with the connecting arm 53 outside the oil tank 1. The other end of the connecting arm 53 is fixedly connected with the telescopic rod end of the electric push cylinder 52.

[0053] The telescopic rod end of the electric push cylinder 52 can drive the sliding rod 54 to move synchronously under the fixed connection of the connecting arm 53, and in turn can drive the push plate 2 to translate in the telescopic direction of the corrugated barrel 4, thereby providing stable driving for the movement and adjustment of the push plate 2.

[0054] Among them, the electric push cylinder 52 can also be replaced by a hydraulic cylinder, an air cylinder, and a screw cylinder, etc.

[0055] Embodiment 2

[0056] Please refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 , the difference between this embodiment and embodiment 1 is:

[0057] The oil tank 1 has an oil discharge pipe 101 on the side away from the cylinder 3, which is in communication with the bottom of the temporary storage cavity 14, and the end of the oil discharge pipe 101 is screwed with a cover 102, i.e., the cover 102 is detachable.

[0058] In addition, the first conduit 141 is arranged in the clamping cavity 13, the top of the first conduit 141 is in communication with the partition plate 11, and the bottom is in communication with the temporary storage cavity 14. Figure 7 As shown, when the corrugated cylinder 4 is retracted to the limit position, the communication position of the first conduit 141 with the temporary storage cavity 14 is located between the oil discharge pipe 101 and the push plate 2, and the first electric valve 142 is installed on the first conduit 141.

[0059] When it is necessary to replace the oil in the installation cavity 12, the corrugated cylinder 4 is retracted to the limit position, at this time, the temporary storage cavity 14 forms a waste oil cavity on the side away from the corrugated cylinder 4 of the push plate 2, then the cover 102 is unscrewed, and the oil discharge pipe 101 is inserted into the waste oil collection tank.

[0060] Subsequently, the first electric valve 142 is adjusted to the open state, the oil in the installation cavity 12 can flow into the waste oil cavity through the first conduit 141, and finally flow into the waste oil collection tank through the oil discharge pipe 101, after the waste oil in the installation cavity 12 is completely drained, the first electric valve 142 is adjusted to the closed state, and then new oil is injected into the installation cavity 12, which realizes the replacement of the oil.

[0061] In addition, the four side end faces of the push plate 2 are tightly and slidably attached to the inner walls of the corresponding sides of the temporary storage cavity 14, so that the side ends of the push plate 2 are tightly attached to the inner walls of the temporary storage cavity 14, when the oil in the installation cavity 12 is completely drained into the waste oil cavity, the push plate 2 is driven to move to the side of the oil discharge pipe 101 by the driving mechanism 5, which can drive the oil to move to the side of the oil discharge pipe 101, which not only accelerates the discharge of the oil, but also helps to completely drain the oil in the waste oil cavity.

[0062] In addition, the connection between the slide rod 54 and the oil tank 1 is sealed, which can prevent the oil in the waste oil cavity from leaking through the gap between the slide rod 54 and the oil tank 1.

[0063] As can be seen, when the corrugated cylinder 4 is retracted, the space for the waste oil cavity in the temporary storage cavity 14 is left, and the oil discharge flow channel is formed in cooperation with the oil discharge pipe 101, which helps to directly guide the waste oil into the external storage tank, reduces the probability of the waste oil contacting external impurities, and effectively reduces the difficulty of recycling the waste oil in the later stage, and secondly, the push plate 2 serves as both a sealing member and a waste oil cavity partition component, achieving two purposes at once.

[0064] Meanwhile, the four side end faces of the push plate 2 are in close sliding fit with the inner walls of the corresponding sides of the temporary storage cavity 14, so that the side ends of the push plate 2 are in close fit with the inner walls of the temporary storage cavity 14. When all the oil bodies in the installation cavity 12 flow into the waste oil cavity, the push plate 2 is driven to move to one side of the oil discharge pipe 101 by the driving mechanism 5, so as to push the oil bodies to move to one side of the oil discharge pipe 101, which not only accelerates the discharge of the oil bodies, but also facilitates the complete discharge of the oil bodies in the waste oil cavity.

[0065] Embodiment 3

[0066] Please refer to Figure 4 、 Figures 9-12 The difference between this embodiment and embodiment 2 is that:

[0067] The oil tank 1 is further provided with a sampling mechanism 6. The sampling mechanism 6 comprises a sleeve 61, a hollow guide rod 62, a sampling cylinder 63, a traction rod 64 and a spring 65. The sleeve 61 is fixed on the top of the oil tank 1 and extends through the installation cavity 12. The hollow guide rod 62 is slidingly inserted into the sleeve 61 in a through manner. The traction rod 64 is slidingly inserted into the hollow guide rod 62 in a through manner. The bottom end of the traction rod 64 is fixed with the sampling cylinder 63.

[0068] The top of the sampling cylinder 63 is provided with a sampling cavity 631 which surrounds the traction rod 64. The top end of the traction rod 64 is fixed with a tail handle 641. The outer part of the hollow guide rod 62 and above the sleeve 61 is fixed with a cover 66. The spring 65 is sleeved outside the hollow guide rod 62 and the traction rod 64, and one end is fixed with the tail handle 641 and the other end is fixed with the cover 66.

[0069] Under the elastic traction of the spring 65, the top end of the sampling cylinder 63 is tightly fitted with the bottom end of the hollow guide rod 62, so that the sampling cavity 631 is in a sealed state.

[0070] When it is necessary to detect the quality of the oil bodies in the installation cavity 12, the tail handle 641 is pressed downward to drive the traction rod 64 to slide downward relative to the hollow guide rod 62. At this time, the spring 65 is compressed and stored, and at the same time, the top end of the sampling cylinder 63 is separated from the bottom end of the hollow guide rod 62, so that the sealing of the sampling cavity 631 is cancelled, and the oil bodies in the installation cavity 12 enter the sampling cavity 631.

[0071] Subsequently, the tail handle 641 is released, and under the elastic reset of the spring 65, the sampling cylinder 63 and the traction rod 64 are lifted, so that the top end of the sampling cylinder 63 is again in abutment with the bottom end of the hollow guide rod 62, so as to seal the sampling cavity 631.

[0072] Then, the hollow guide rod 62 is pulled up, the hollow guide rod 62, the sampling cylinder 63 and the traction rod 64 are moved upward as a whole until the top end of the sampling cylinder 63 moves above the sleeve 61, the tail handle 641 is pressed downward again to cancel the blocking of the sampling cavity 631, the oil sample in the sampling cavity 631 is extracted by the syringe, and then detection analysis can be performed. After the detection is completed, the hollow guide rod 62 is pushed downward to reset.

[0073] In addition, since the hollow guide rod 62, the sampling cylinder 63 and the traction rod 64 have the ability to be adjusted up and down relative to the sleeve 61, combined with the mechanism that the top end of the traction rod 64 is in contact with the bottom end of the hollow guide rod 62 after the oil body enters the sampling cavity 631 and is elastically restrained by the spring 65 to block the sampling cavity 631, the oil body at different depths in the installation cavity 12 can be collected to improve the accuracy of the quality detection and evaluation of the oil body in the installation cavity 12.

[0074] Among them, after sampling the oil body at different heights, and before resetting the sampling cylinder 63 into the installation cavity 12, cleaning the sampling cavity 631 can avoid cross contamination between different samplings.

[0075] As shown in Figure 12 The top of the sleeve 61 has a slope surface 611 with a height that is higher closer to the hollow guide rod 62 and an arc-shaped cross section. The outer wall of the hollow guide rod 62 is in close contact with the inner hole wall of the sleeve 61. When the hollow guide rod 62 is moved downward to reset into the installation cavity 12, the sleeve 61 can scrape off the dirt and impurities adsorbed on the outer wall of the hollow guide rod 62 exposed to the outside, avoiding pollution caused by the hollow guide rod 62 entering the installation cavity 12. In addition, the scraped dirt can roll outward through the slope surface 611 at the top of the sleeve 61, which is convenient for cleaning and avoids accumulation of dirt on the top of the sleeve 61.

[0076] In addition, the lower surface of the cover 66 has a recessed surface 661 that matches the slope surface 611. The top of the oil tank 1 is fixed with a vertically upward extending fastening screw 68. The side of the cover 66 is fixed with a fixed foot 67 having a through hole 671 for the fastening screw 68 to pass through. The fastening screw 68 is further provided with a fastening nut 69.

[0077] When the hollow guide rod 62 is completely reset into the installation cavity 12, the recessed surface 661 matches and fits the slope surface 611. Then, the fastening screw 68 passes through the through hole 671, and the fastening nut 69 is tightened on the fastening screw 68, which can lock the cover 66 and the sleeve 61 to avoid oil leakage. The rubber pad fixed on the recessed surface 661 further improves the sealing effect when it is in close contact with the slope surface 611.

[0078] Secondly, the slope surface 611 and the recessed surface 661 are curvedly matched, which increases the contact area and also plays a role in increasing the sealing effect.

[0079] As Figure 11 shown, the lower end of the sampling cylinder 63 is fixed with an anti-off disc 632, the diameter of the anti-off disc 632 is greater than the inner hole diameter of the sleeve 61, in the process of pulling the hollow guide rod 62 upward, the anti-off disc 632 is blocked with the sleeve 61, which plays a limiting effect, avoiding the hollow guide rod 62, the sampling cylinder 63 and the traction rod 64 from being pulled out from the sleeve 61.

[0080] Example 4

[0081] Please refer to Figure 1 , Figure 3 and Figure 5 , the difference between this embodiment and example 3 is:

[0082] The base 01 is provided with a protective basket 04 on one side of the oil tank 1, the protective basket 04 is provided with a radiator 05, the radiator 05 is composed of two groups of heat dissipation modules, which is used for heat dissipation and cooling of the transformer, the specific structure and heat dissipation principle are consistent with the prior art, and the present application will not be disclosed in detail.

[0083] In addition, a plurality of heat dissipation plates 15 are arranged in the clamping cavity 13 along the extension direction of the corrugated cylinder 4, the heat dissipation plates 15 and the upper and lower two partition plates 11 form a support grid, which provides internal support between the mounting cavity 12 and the temporary storage cavity 14, and has the effect of improving the overall structural strength of the oil tank 1.

[0084] Secondly, the heat dissipation plates 15 are in the shape of inverted T, and are made of aluminum, one end of each heat dissipation plate 15 extends through the mounting cavity 12, and the other end extends to the outside of the oil tank 1 and is connected with the radiator 05, in work, the heat dissipation plates 15 are directly in contact with the oil in the mounting cavity 12, and absorb and transfer the heat in the oil to the radiator 05, which plays an auxiliary heat dissipation effect, and further ensures the stability of the transformer.

[0085] The heat dissipation plates 15 serve as both internal support and heat dissipation conductive parts, achieving two purposes at once.

[0086] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application.

Claims

1. A multifunctional integrated photovoltaic box transformer, comprising a high-voltage box (02), a low-voltage box (03) and an oil tank (1) arranged in sequence on a base (01), two upper and lower distribution baffles (11) are fixed in the oil tank (1), and an installation cavity (12), a clamping cavity (13) and a temporary storage cavity (14) are sequentially formed in the oil tank (1) from top to bottom, characterized in that: a cylinder (3) is fixed on the inner wall of one side of the temporary storage cavity (14), and a corrugated cylinder (4) is fixedly connected to the end edge of the cylinder (3); a push plate (2) is matched and installed in the temporary storage cavity (14), one end of the corrugated cylinder (4) away from the cylinder (3) is fixed with the push plate (2), so as to form a space-variable cavity (401) in the cylinder (3) and the corrugated cylinder (4); the cylinder (3) is connected with a second conduit (41) in communication, the second conduit (41) penetrates through the clamping cavity (13) and communicates with the bottom of the installation cavity (12), and a second electric valve (42) is installed on the second conduit (41); a driving mechanism (5) is arranged on the side of the oil tank (1), and the driving mechanism (5) is used for driving the push plate (2) to translate along the extension and retraction direction of the corrugated cylinder (4); a sampling mechanism (6) is further arranged on the oil tank (1); an oil discharge pipe (101) is arranged on the side of the oil tank (1) away from the cylinder (3), and the oil discharge pipe (101) communicates with the bottom of the temporary storage cavity (14); a cover (102) is threadedly connected to the end of the oil discharge pipe (101); a first conduit (141) is arranged in the clamping cavity (13), and the top of the first conduit (141) communicates with the baffle (11), and the bottom of the first conduit (141) communicates with the temporary storage cavity (14); when the corrugated cylinder (4) is retracted to the limit position, the communication part of the first conduit (141) and the temporary storage cavity (14) is located between the oil discharge pipe (101) and the push plate (2); and a first electric valve (142) is installed on the first conduit (141). 2.The multifunctional integrated photovoltaic box transformer according to claim 1, characterized in that: the four side end faces of the push plate (2) are respectively closely and slidingly attached to the corresponding side inner walls of the temporary storage cavity (14). 3.The multifunctional integrated photovoltaic box transformer according to claim 1, characterized in that: the driving mechanism (5) comprises a fixed seat (51), an electric push cylinder (52), a connecting arm (53) and a sliding rod (54); the electric push cylinder (52) is fixed on the side of the oil tank (1) through the fixed seat (51); the sliding rod (54) is inserted and arranged in the oil tank (1) in a through sliding mode, and one end of the sliding rod (54) extends into the temporary storage cavity (14) and is fixed with the push plate (2); the connecting arm (53) is fixed on the end of the sliding rod (54) outside the oil tank (1), and the other end of the connecting arm (53) is fixedly connected with the telescopic rod end of the electric push cylinder (52). 4.The multifunctional integrated photovoltaic box transformer according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The sampling mechanism (6) comprises a sleeve (61), a hollow guide rod (62), a sampling cylinder (63), a traction rod (64) and a spring (65); The sleeve (61) is fixed on the top of the oil tank (1) and extends through the installation cavity (12); The hollow guide rod (62) is slidably inserted into the sleeve (61), and the traction rod (64) is slidably inserted into the hollow guide rod (62); The bottom end of the traction rod (64) is fixed with the sampling cylinder (63), and the top of the sampling cylinder (63) is provided with a sampling cavity (631) distributed around the traction rod (64); The top end of the traction rod (64) is fixed with a tail handle (641), and the outside of the hollow guide rod (62) and above the sleeve (61) is fixed with a cover (66); The spring (65) is sleeved outside the hollow guide rod (62) and the traction rod (64), and one end is fixed with the tail handle (641) and the other end is fixed with the cover (66); Under the elastic restraint force of the spring (65), the top end of the sampling cylinder (63) is tightly combined with the bottom end of the hollow guide rod (62), and the sealing of the sampling cavity (631) is realized.

5. The multifunctional integrated photovoltaic box transformer according to claim 4, characterized in that: The top of the sleeve (61) is provided with a slope surface (611) which is higher near the hollow guide rod (62) and the cross section is arc-shaped.

6. The multifunctional integrated photovoltaic box transformer according to claim 5, characterized in that: The lower surface of the cover (66) is provided with a concave surface (661) which is matched with the slope surface (611), and the concave surface (661) is matched with the slope surface (611); The concave surface (661) is fixed with a rubber pad.

7. The multifunctional integrated photovoltaic box transformer according to claim 4, characterized in that: The top of the oil tank (1) is fixed with a fastening screw rod (68) which extends vertically upward; The side of the cover (66) is fixed with a fixing foot (67) which is provided with a through hole (671) through which the fastening screw rod (68) passes; The fastening screw rod (68) is further provided with a fastening nut (69); After the fastening screw rod (68) passes through the through hole (671) and the fastening nut (69) is tightened on the fastening screw rod (68), the cover (66) and the sleeve (61) can be locked.

8. The multifunctional integrated photovoltaic box transformer according to claim 4, characterized in that: The lower end of the sampling cylinder (63) is fixed with an anti-dropping disc (632) which is larger in diameter than the inner hole diameter of the sleeve (61).

9. The multifunctional integrated photovoltaic box transformer according to claim 6, characterized in that: The base (01) is provided with a protective basket (04) on one side of the oil tank (1), and the protective basket (04) is installed with a radiator (05) for cooling the transformer. A plurality of heat dissipation plates (15) are arranged in the clamping cavity (13) at intervals along the telescopic direction of the corrugated cylinder (4); The heat dissipation plates (15) are in the shape of inverted T and are made of aluminum; One end of each of the heat dissipation plates (15) extends through to the mounting cavity (12), and the other end extends through to the outside of the oil tank (1) and is connected with the radiator (05).

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