Vacuumizing flat-plate solar collector and vacuum system thereof

Abstract

The invention discloses a vacuum-pumping flat-plate solar collector and a vacuum system thereof, the vacuum-pumping flat-plate solar collector is composed of a glass cover plate, a shell and a heat collection plate core, the shell of the vacuum-pumping flat-plate solar collector is provided with a vacuum-pumping opening, the vacuum-pumping opening is connected with a vacuum pump through a connecting pipeline, and the vacuum pump is connected with a controller. A vacuumizing opening connected with a vacuum pump is formed in a vacuumizing flat-plate solar collector, the vacuum pump is started firstly to complete vacuumizing operation on a system, and in the later operation period of the system, a controller is used for controlling the vacuum pump to conduct timing vacuumizing on the vacuumizing flat-plate solar collector. The vacuum degree of the closed cavity in the vacuumized flat-plate solar collector is kept high all the time, so that the heat collection effect of the vacuumized flat-plate solar collector is guaranteed, the utilization rate of heat energy is improved, and the service life of the product is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of solar thermal collectors, and in particular to a vacuum flat-plate solar thermal collector and a vacuum system thereof. Background Art

[0002] At present, vacuum flat-plate solar collectors are generally evacuated and sealed in the workshop. Since vacuum sealing is difficult in China and there is no relevant sealing technology, gas will slowly penetrate into the cavity after sealing with sealant, which will reduce the vacuum degree in the cavity and cause the vacuum collector to fail.

[0003] If vacuum sealant is used, it will be expensive, have low market acceptance and be difficult to promote.

[0004] Another way is to seal the glass and metal shell by melting them, but this process is complicated, costly, and also difficult to commercialize.

[0005] Therefore, it is necessary to provide a vacuum flat-plate solar collector and a vacuum system thereof to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a vacuum flat-plate solar collector and its vacuum system to address the deficiencies in the prior art. The system is used to regularly vacuum the flat-plate solar collector so that the interior of the flat-plate solar collector can always maintain a vacuum state, greatly improving the heat collection effect.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A vacuum flat-plate solar collector and its vacuum system. The vacuum flat-plate solar collector consists of a glass cover, a shell and a collector plate core. The shell of the vacuum flat-plate solar collector is provided with a vacuum port, the vacuum port is connected to a vacuum pump through a connecting pipe, and the vacuum pump is connected to a controller.

[0009] Preferably, the shell includes four side panels and a bottom plate, both of which are corrugated plates, and the lower edges of the four side panels are sealed and fixed to the bottom plate, the heat collecting plate core is horizontally placed in the shell, the heat collecting plate core includes a heat absorbing plate and a heat collecting flow channel, the heat collecting flow channel is fixed on the heat absorbing plate, the heat absorbing plate is provided with through holes distributed in an array, and support bars are arranged under the heat collecting plate core, the support bars include a plurality of transverse support bars arranged along the width direction of the vacuum flat-plate solar collector, and a plurality of longitudinal support bars arranged along the length direction of the vacuum flat-plate solar collector, both ends of the support bars are connected to the inner wall of the shell, the transverse support bars and the longitudinal support bars together constitute a grid-like support structure, a top column is provided between the transverse support bar and the glass cover plate, and the top column passes through the heat absorbing plate through the through hole.

[0010] Preferably, the bottom plate is provided with an outlet and an inlet of a heat collecting channel, the heat collecting channel is fixed to the back of the heat absorbing plate, the liquid inlet end of the heat collecting channel is sealed and fixedly connected to the inlet, and the liquid outlet end of the heat collecting channel is sealed and fixedly connected to the outlet.

[0011] Preferably, the transverse support bars, the longitudinal support bars and the top column form a three-dimensional support structure inside the vacuum flat-plate solar thermal collector, so that the vacuum flat-plate solar thermal collector can withstand high vacuum negative pressure.

[0012] Preferably, the upper edge of the shell and the glass cover plate are sealed by a sealant, and the shell and the glass cover plate together form a sealed cavity.

[0013] Preferably, the connecting pipes of a plurality of vacuum flat-plate solar collectors are connected in parallel to a connecting main pipe, and the connecting main pipe is connected to a vacuum pump.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. A vacuum port connected to a vacuum pump is provided on the vacuum flat-plate solar collector, and the vacuum pump is controlled by a controller to perform timed vacuuming on the vacuum flat-plate solar collector, so that the closed chamber inside the vacuum flat-plate solar collector always maintains a high vacuum degree, thereby ensuring the heat collection effect of the vacuum flat-plate solar collector and improving the utilization rate of thermal energy.

[0016] 2. Utilize the horizontal support bars and the longitudinal support bars to form a grid-like support structure together in the horizontal direction, and then utilize the horizontal support bars, the longitudinal support bars and the top column to form a three-dimensional support structure inside the vacuum flat-plate solar collector, so that the pressure bearing capacity of the sealed chamber of the vacuum flat-plate solar collector is greatly improved, ensuring that the vacuum pump's vacuuming will not damage the structure of the vacuum flat-plate solar collector, so that the sealing is guaranteed.

[0017] 3. The current vacuum flat-plate solar collector has been evacuated before leaving the factory. After leaving the factory, the vacuum inside cannot be manually intervened except for natural leakage, and the service life is limited. The present invention can be evacuated by the system after on-site installation, and can be repeatedly evacuated, ensuring that the closed chamber inside the vacuum flat-plate solar collector always maintains a high vacuum degree, extending the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a front view of a vacuum flat-plate solar collector;

[0020] Figure 3is a side view of an evacuated flat-plate solar collector;

[0021] Figure 4 It is the front view of the base plate;

[0022] Among them, 1-glass cover plate, 2-side plate, 201-vacuum port, 3-heat collecting plate core, 301-heat absorbing plate, 302-heat collecting flow channel, 303-through hole, 4-bottom plate, 401-outlet, 402-inlet, 5-vacuum pump, 6-controller, 7-lateral support bar, 8-longitudinal support bar, 9-top column DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0024] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixed connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0025] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0026] like Figures 1 to 4 As shown, a vacuum flat-plate solar collector and its vacuum system, the vacuum flat-plate solar collector is composed of a glass cover 1, a shell and a collector plate core 3, the vacuum flat-plate solar collector is provided with a vacuum port 201, the vacuum port is arranged on the side of the shell, the vacuum port and the shell are welded and sealed, the vacuum port is connected to a vacuum pump 5 through a connecting pipe, and the vacuum pump is connected to a controller 6.

[0027] The shell is surrounded by four corrugated plates as side plates 2 and welded and sealed to form a frame structure with a rectangular cross-section, and then a corrugated plate is used as the bottom plate 4 and welded and sealed with the lower edges of the four side plates. The heat collecting plate core is placed horizontally in the shell, and the heat collecting plate core includes a heat absorbing plate 301 and a heat collecting channel 302. The heat collecting channel is welded and fixed on the back of the heat absorbing plate. The bottom plate is provided with an outlet 401 and an inlet 402 of the heat collecting channel. The liquid inlet end of the heat collecting channel is welded and sealed with the inlet, and the liquid outlet end of the heat collecting channel is welded and sealed with the outlet. The heat absorbing plate is provided with through holes 303 distributed in an array, and a support bar is arranged under the heat collecting plate core. The support bar includes a vacuum plate along the bottom plate. A plurality of transverse support bars 7 are arranged in the width direction of the solar collector, and a plurality of longitudinal support bars 8 are arranged along the length direction of the vacuum flat-plate solar collector. Both ends of the support bars are fixed to the top of the inner wall of the shell. The transverse support bars and the longitudinal support bars together form a grid-like support structure in the horizontal direction. A top column 9 is installed between the transverse support bars and the glass cover. The top column passes through the heat-absorbing plate by a through hole. Both ends of the top column are respectively fixed to the transverse support bars and the glass cover. The transverse support bars, the longitudinal support bars and the top column form a three-dimensional support structure inside the vacuum flat-plate solar collector, so that the vacuum flat-plate solar collector can withstand high vacuum negative pressure.

[0028] The upper edge of the shell and the glass cover plate are sealed by sealant, and the shell and the glass cover plate together form a sealed cavity.

[0029] The connecting pipes of the three vacuum flat-plate solar collectors are connected in parallel to a connecting main pipe, and the connecting main pipe is connected to a vacuum pump, so that the controller can use the vacuum pump to simultaneously perform timed vacuuming on the three vacuum flat-plate solar collectors, thereby improving the use efficiency of the system.

[0030] A principle and use method of a vacuum flat-plate solar collector and its vacuum system: by setting the vacuum time period on the controller, the vacuum pump is controlled to regularly vacuum the vacuum flat-plate solar collector, so that the internal chamber of the vacuum flat-plate solar collector always maintains a high vacuum degree, ensuring that the vacuum flat-plate solar collector always maintains an efficient heat collection effect; at the same time, horizontal support bars, longitudinal support bars and top columns are used to form a three-dimensional support structure inside the vacuum flat-plate solar collector, so that when the chamber inside the vacuum flat-plate solar collector maintains a high vacuum degree, the entire structure can withstand high vacuum negative pressure and will not suffer structural damage.

[0031] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A vacuum flat-plate solar collector and its vacuum system, the vacuum flat-plate solar collector is composed of a glass cover, a shell and a collector plate core, characterized in that: The shell of the vacuum flat-plate solar collector is provided with a vacuum port, the vacuum port is connected to a vacuum pump through a connecting pipe, and the vacuum pump is connected to a controller.

2. The vacuum flat-plate solar collector and its vacuum system according to claim 1, characterized in that: The shell includes four side panels and a bottom plate, both of which are corrugated plates, and the lower edges of the four side panels are sealed and fixed to the bottom plate. The heat collecting plate core is horizontally placed in the shell, and the heat collecting plate core includes a heat absorbing plate and a heat collecting flow channel, and the heat collecting flow channel is fixed on the heat absorbing plate. The heat absorbing plate is provided with array-distributed through holes, and support bars are arranged below the heat collecting plate core, and the support bars include a plurality of transverse support bars arranged along the width direction of the vacuum flat-plate solar collector, and a plurality of longitudinal support bars arranged along the length direction of the vacuum flat-plate solar collector. Both ends of the support bars are connected to the inner wall of the shell, and the transverse support bars and the longitudinal support bars together constitute a grid-like support structure. A top column is provided between the transverse support bar and the glass cover plate, and the top column passes through the heat absorbing plate through the through hole.

3. The vacuum flat-plate solar collector and its vacuum system according to claim 2, characterized in that: The bottom plate is provided with an outlet and an inlet of a heat collecting channel, the heat collecting channel is fixed on the back of the heat absorbing plate, the liquid inlet end of the heat collecting channel is sealed and fixedly connected to the inlet, and the liquid outlet end of the heat collecting channel is sealed and fixedly connected to the outlet.

4. The vacuum flat-plate solar collector and its vacuum system according to claim 2, characterized in that: The transverse support bars, the longitudinal support bars and the top column form a three-dimensional support structure inside the vacuum flat-plate solar thermal collector, so that the vacuum flat-plate solar thermal collector can withstand vacuum negative pressure.

5. The vacuum flat-plate solar collector and its vacuum system according to claim 2, characterized in that: The upper edge of the shell and the glass cover plate are sealed by sealant, and the shell and the glass cover plate together form a sealed cavity.

6. The vacuum flat-plate solar collector and its vacuum system according to claim 1, characterized in that: The connecting pipes of a plurality of vacuum flat-plate solar collectors are connected in parallel to a connecting main pipe, and the connecting main pipe is connected to a vacuum pump.

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