Automatic anti-freezing solution supplementing device for solar heating system

Abstract

An automatic anti-freezing solution supplementing device for a solar heating system is integrally a three-way shell, the three-way shell comprises a straight pipe and a branch pipe, an inner cavity of the straight pipe is communicated with an inner cavity of the branch pipe, and two ports of the straight pipe are an inlet and an outlet respectively. The end opening of the branch pipe is a pressure guiding opening, a control cavity and a valve element are sequentially arranged on the pressure guiding opening inwards, the control cavity drives the valve element to reciprocate in the axial direction of the branch pipe, and when the valve element moves to the lowest point in the straight pipe, the inlet is closed. Through reasonable arrangement of component structures, an outlet of the pressure difference control valve and a pressure guide opening are connected with a water pipe, and pressure in a straight pipe and a control cavity is adjusted according to pressure of the water pipe, so that the control cavity drives a valve element to reciprocate in the axial direction of a branch pipe, start and stop of an automatic anti-freezing solution supplementing device are controlled, and pipe network pressure is maintained within a set working condition; the heat supply quality of the system is guaranteed, the overall structure is simple, cost is low, and operation is easy; the problems that a hot water supply system is poor in stability, and an existing self-control water supplementing system is complex in operation and high in cost are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar heating systems, and in particular relates to a pressure difference control valve and an automatic antifreeze liquid supplementing device for a solar heating system. Background Art

[0002] In recent years, solar heating technology has developed rapidly. In solar heating systems that use antifreeze as a heat transfer medium, in order to ensure the stability and normal heat exchange of the system, the heating water system needs to maintain a certain system circulation pressure. However, since the system is inevitably leaking during operation, it is inevitable that the pressure of the heating water system will decrease, resulting in a decrease in the quality of heating. Therefore, a water replenishment device needs to be installed in the solar heating system to maintain the normal operation of the heating system. The existing technology usually uses an automatic water replenishment system to replenish water at a constant pressure for the solar heating system, but it usually requires the operator to have certain automatic control knowledge. In addition, the cost of the automatic control device is relatively high, which has a certain economic burden on the heat user. Summary of the invention

[0003] In view of the above problems, the purpose of the utility model is to provide an automatic antifreeze replenishing device for a solar heating system, which solves the problems of poor stability of the heating water system and complex operation and high cost of the existing automatic water replenishing system.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model includes:

[0005] An automatic antifreeze replenishment device for a solar heating system comprises a pressurized liquid storage tank, a pressure reducing valve and a pressure differential control valve connected in series in sequence, the pressure differential control valve is a three-way shell as a whole, the three-way shell comprises a straight pipe and a branch pipe connected with an inner cavity, the two ends of the straight pipe are an inlet and an outlet respectively; the branch pipe port is a pressure guide port, and a control cavity and a valve core are sequentially arranged inwardly of the pressure guide port, the control cavity drives the valve core to reciprocate along the axial direction of the branch pipe, and when the valve core moves to the lowest point in the straight pipe, the inlet is closed; the inlet of the pressure differential control valve is connected to the outlet of the pressure reducing valve, and the outlet and the pressure guide port of the pressure differential control valve are both connected to a water pipe.

[0006] Preferably, an elastic diaphragm is provided on the inner wall of the control cavity, which divides the control cavity into a first cavity and a second cavity from top to bottom, and both the first cavity and the second cavity are sealed cavities; a support plate which can slide axially along the branch pipe is provided on the inner wall of the second cavity, a spring is connected between the elastic diaphragm and the support plate, and a valve stem is connected between the valve core and the support plate.

[0007] Preferably, the inner wall of the second cavity is further provided with a guide groove parallel to the axis thereof, and the support sheet is slidably arranged in the guide groove.

[0008] Preferably, the second cavity (end is a limit sealing plate, and the valve stem seal passes through the limit sealing plate.

[0009] Preferably, the pressure guide port of the differential pressure control valve is connected to the water pipe via a pressure guide pipe.

[0010] Preferably, the pressurized liquid storage tank, the pressure reducing valve, the pressure difference control valve and the water pipe are sequentially connected in series through pipelines.

[0011] Preferably, the pressurized liquid storage tank is divided into a closed air cavity and a liquid cavity by a gas-liquid diaphragm, and the pressure reducing valve is connected to the liquid cavity.

[0012] Preferably, the air cavity contains pressurized gas and the liquid cavity contains antifreeze liquid.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] (1) The utility model is a device for automatically replenishing antifreeze liquid for a solar heating system. Through the reasonable arrangement of the component structure, the outlet and the pressure guide port of the pressure difference control valve are connected to the water pipe. The pressure in the straight pipe and the control chamber is adjusted according to the pressure of the water pipe, so that the control chamber drives the valve core to reciprocate along the axial direction of the branch pipe to realize the start and stop control of the automatic antifreeze liquid replenishing device, so as to maintain the pressure of the pipeline network within the set working condition and ensure the heating quality of the system. The overall structure is simple, low-cost and easy to operate.

[0015] (2) The utility model of the automatic antifreeze replenishing device for the solar heating system, through the reasonable arrangement of the component structure, only needs to set the pressure behind the pressure reducing valve when in use, and relies on the pressure difference control valve to adjust the opening to ensure the normal operation of the water pressure in the water pipe of the pipeline network, without requiring excessive intervention from the operator. It has a simple structure, low cost, and simple operation, and can be better accepted by users and achieved large-scale promotion.

[0016] (3) The automatic antifreeze replenishing device for the solar heating system of the utility model has a reasonable arrangement of the component structure. The pressure of the antifreeze in the pressurized liquid storage tank should be higher than the set operating pressure of the heating water system. After the pressurized antifreeze passes through the pressure reducing valve, the pressure is reduced to the set operating pressure of the heating water system, so that the water inlet pressure of the pressure difference control valve is equal to the set operating pressure of the heating water system. When the actual operating pressure of the heating water system is lower than the set operating pressure, it is ensured that the water replenishing device has sufficient pressure difference to start the pressure difference control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the automatic antifreeze replenishment device for a solar heating system according to the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the medium pressure differential control valve;

[0020] The symbols in the figure represent:

[0021] 1 pressurized liquid storage tank, 2 pressure reducing valve, 3 pressure pipe, 4 pipeline, 5 water pipe, 6 differential pressure control valve;

[0022] 1-1 pressurized gas, 1-2 gas-liquid diaphragm, 1-3 antifreeze;

[0023] 601 inlet, 602 outlet, 603 pressure port, 61 control cavity, 611 first cavity, 612 second cavity, 62 elastic diaphragm, 63 valve stem, 64 spring, 65 support plate; 655 guide groove; 66 valve core; 67 limit sealing plate. DETAILED DESCRIPTION

[0024] The utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the utility model.

[0025] It should be noted that the directional terms mentioned in this article, such as "inner cavity", "inner periphery", "inner wall" and "outside", are consistent with the specific directions on the paper in the drawings of the specification or the corresponding directions of the space shown in the drawings; the standard parts used in the utility model can be purchased from the market, and can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art, and the machinery, parts and equipment all adopt conventional models in the prior art.

[0026] Example 1

[0027] This embodiment discloses a differential pressure control valve, which is a three-way housing as a whole. The three-way housing includes a straight pipe and a branch pipe connected with each other in the inner cavity. The two ends of the straight pipe are an inlet 601 and an outlet 602 respectively. The branch pipe port is a pressure guide port 603. The pressure guide port 603 is provided with a control cavity 61 and a valve core 66 inward in sequence. The control cavity 61 drives the valve core 66 to reciprocate along the axial direction of the branch pipe. When the valve core 66 moves to the lowest point in the straight pipe, the inlet 601 is closed.

[0028] Its function is: when it is applied to the automatic antifreeze replenishment device of the solar heating system, the outlet 602 and the pressure guide port 603 of the pressure difference control valve 6 are connected to the water pipe 5, and the pressure in the straight pipe and the control chamber 61 is adjusted according to the pressure of the water pipe 5, so that the control chamber 61 drives the valve core 66 to reciprocate along the axial direction of the branch pipe to realize the start and stop control of the automatic antifreeze replenishment device, and maintain the pipe network pressure within the set working conditions to ensure the heating quality of the system. The overall structure is simple, low cost and easy to operate.

[0029] Among them, the water pipe 5 is the water supply main pipe of the solar heating system.

[0030] Specifically, the inner wall of the control cavity 61 is provided with an elastic diaphragm 62 which divides the control cavity 61 into a first cavity 611 and a second cavity 612, and both the first cavity 611 and the second cavity 612 are sealed cavities; the inner wall of the second cavity 612 is provided with a support sheet 65 which can slide along the axial direction of the branch pipe, a spring is connected between the elastic diaphragm 62 and the support sheet 65, and a valve stem 63 is connected between the valve core 66 and the support sheet 65;

[0031] Its function is: when the water pressure in the water pipe 5 is greater than the water pressure at the inlet 601 of the differential pressure control valve 6, that is, the pressure at the pressure guide port 603 of the differential pressure control valve 6 is greater than the water pressure at the inlet 601, the elastic diaphragm 62 expands under pressure, causing the spring 64 to be compressed and transmits the pressure to the top of the valve core 66 through the support sheet 65. At the same time, the bottom of the valve core 66 is always subjected to the water pressure at the inlet 601 of the differential pressure control valve 6. Since the water pressure in the water pipe 5 is greater than the water pressure at the inlet 601 of the differential pressure control valve 6, the valve core 66 moves downward until the differential pressure control valve 6 is in a closed state (the inlet 601 is closed), and the system stops replenishing water; conversely, when the water pressure in the water pipe 5 is less than the water pressure at the inlet 601 of the differential pressure control valve 6, the differential pressure control valve 6 opens, and the system starts replenishing water.

[0032] According to the embodiment disclosed, the inner wall of the second cavity 612 is further provided with a guide groove 655 parallel to the axis thereof, and the support sheet 65 is slidably arranged in the guide groove 655 , so that the support sheet 65 moves along the guide groove 655 .

[0033] In the embodiment disclosed, the end of the second cavity 612 is a limit sealing plate 67, and the valve stem 63 seals and passes through the limit sealing plate 67. On the one hand, it ensures the sealing inside the second cavity 612 to prevent the water in the straight pipe from flowing back into the second cavity 612. On the other hand, when the water pressure in the water pipe 5 is lower than the water pressure at the inlet 601 of the differential pressure control valve 6, the upward movement of the valve core 66 is limited.

[0034] Example 2

[0035] This embodiment discloses an automatic antifreeze replenishment device for a solar heating system, comprising a pressurized liquid storage tank 1, a pressure reducing valve 2 and a pressure differential control valve 6 connected in series in sequence, wherein the pressure differential control valve 6 is the pressure differential control valve of embodiment 1; an inlet 601 of the pressure differential control valve 6 is connected to an outlet of the pressure reducing valve 2, and an outlet 602 and a pressure guide port 603 of the pressure differential control valve 6 are both connected to a water pipe 5;

[0036] Its function is: when in use, it is only necessary to set the pressure behind the pressure reducing valve 2, and the normal operation of the water pressure in the pipe network 5 can be ensured by adjusting the opening of the differential pressure control valve 6 itself, without too much intervention from the operator. It has a simple structure, low cost, and simple operation, and can be better accepted by users and achieved large-scale promotion.

[0037] The pressurized liquid storage tank 1 disclosed in this embodiment is divided into a closed gas cavity and a liquid cavity by a gas-liquid diaphragm 1-2, and the pressure reducing valve 2 is connected to the liquid cavity. The gas cavity contains pressurized gas 1-1, and the liquid cavity contains antifreeze 1-3. The pressure of the antifreeze 1-3 in the pressurized liquid storage tank 6 should be higher than the set operating pressure of the heating water system. After the pressurized antifreeze passes through the pressure reducing valve 5, the pressure is reduced to the set operating pressure of the heating water system, so that the water inlet pressure of the differential pressure control valve 6 is equal to the set operating pressure of the heating water system. When the actual operating pressure of the heating water system is lower than the set operating pressure, it is ensured that the water replenishment device has enough pressure difference to start the differential pressure control valve 6.

[0038] The pressure guide port 603 of the differential pressure control valve 6 disclosed in this embodiment is connected to the water pipe 5 through the pressure guide pipe 3, and the pressurized liquid storage tank 1, the pressure reducing valve 2, the differential pressure control valve 6 and the water pipe 5 are connected in series in sequence through the pipeline 4.

[0039] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0041] In addition, the various different implementation modes disclosed in this solution may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the content invented by the present disclosure.

Claims

1. An automatic antifreeze replenishment device for a solar heating system, characterized in that: The invention comprises a pressurized liquid storage tank (1), a pressure reducing valve (2) and a pressure differential control valve (6) which are connected in series in sequence, wherein the pressure differential control valve (6) is a three-way shell as a whole, and the three-way shell comprises a straight pipe and a branch pipe which are connected in the inner cavity, and the two ends of the straight pipe are respectively an inlet (601) and an outlet (602); The branch pipe port is a pressure-guiding port (603), and a control chamber (61) and a valve core (66) are sequentially arranged inwardly of the pressure-guiding port (603). The control chamber (61) drives the valve core (66) to reciprocate along the axial direction of the branch pipe. When the valve core (66) moves to the lowest point in the straight pipe, the inlet (601) is closed. The inlet (601) of the differential pressure control valve (6) is connected to the outlet of the pressure reducing valve (2), and the outlet (602) and the pressure guide port (603) of the differential pressure control valve (6) are both connected to the water pipe (5).

2. The automatic antifreeze replenishment device for a solar heating system according to claim 1, characterized in that: The inner wall of the control cavity (61) is provided with an elastic diaphragm (62) which divides the control cavity (61) into a first cavity (611) and a second cavity (612) at the top and bottom, and the first cavity (611) and the second cavity (612) are both sealed cavities; The inner wall of the second cavity (612) is provided with a support sheet (65) that can slide along the axial direction of the branch pipe, a spring is connected between the elastic diaphragm (62) and the support sheet (65), and a valve stem (63) is connected between the valve core (66) and the support sheet (65).

3. The automatic antifreeze replenishing device for a solar heating system according to claim 2, characterized in that: The inner wall of the second cavity (612) is also provided with a guide groove (655) parallel to the axis thereof, and the support sheet (65) is slidably arranged in the guide groove (655).

4. The automatic antifreeze replenishing device for a solar heating system according to any one of claims 2-3, characterized in that: The end of the second cavity (612) is a limit sealing plate (67), and the valve stem (63) seals and passes through the limit sealing plate (67).

5. The automatic antifreeze replenishment device for a solar heating system according to claim 4, characterized in that: The pressure guide port (603) of the differential pressure control valve (6) is connected to the water pipe (5) via a pressure guide pipe (3).

6. The automatic antifreeze replenishment device for a solar heating system according to claim 5, characterized in that: The pressurized liquid storage tank (1), the pressure reducing valve (2), the pressure difference control valve (6) and the water pipe (5) are sequentially connected in series via a pipeline (4).

7. The automatic antifreeze replenishment device for a solar heating system according to claim 6, characterized in that: The pressurized liquid storage tank (1) is divided into a sealed air cavity and a liquid cavity by a gas-liquid diaphragm (1-2), and the pressure reducing valve (2) is connected to the liquid cavity.

8. The automatic antifreeze replenishment device for a solar heating system according to claim 7, characterized in that: The air cavity contains pressurized gas (1-1), and the liquid cavity contains antifreeze liquid (1-3).

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