Expansion device of non-pressure closed heat supply system

Abstract

The utility model discloses an expansion device of a non-pressure closed heat supply system, and mainly relates to the field of water pressure adjusting equipment of a heat supply system. Comprising a hollow shell, a top cover capable of being opened and closed is arranged at the top of the shell, a connecting pipe is communicated with the bottom of the shell, an elastic capsule is arranged at the bottom in the shell, fixing pieces are symmetrically arranged on the inner side wall of the shell, the two sides of the elastic capsule are connected with the two fixing pieces respectively, and the connecting pipe is communicated with the interior of the elastic capsule. A pressing part connected with the top of the elastic capsule is arranged in the shell and can press the elastic capsule to plug the connecting pipe. The utility model has the beneficial effects that the elastic capsule directly absorbs the expansion water quantity of the system, regulates the pressure of the system, ensures that the water of the system is isolated from the environment, reduces the water shortage of the system caused by evaporation, ensures the stable operation of the system, has a simple structure, does not directly contact the shell with the liquid, can discharge the accumulated water in the device in time, prevents the device from being rusted, and ensures the safety of the device. The expansion effect of the elastic capsule is not affected, and the practicability is better.

Description

Technical Field

[0001] The utility model relates to the field of water pressure regulating equipment for heating systems, in particular to an expansion device for a pressure-free closed heating system. Background Art

[0002] The working principle of the expansion tank is that when pressurized water from the outside enters the expansion tank airbag, the nitrogen sealed in the tank is compressed. According to Boyle's gas law, the volume of the gas decreases and the pressure increases after compression. Water will stop entering the expansion tank when the gas pressure reaches the same level as the water pressure. When the water loses and the pressure decreases, the gas pressure in the expansion tank is greater than the water pressure. At this time, the air pressure in the tank squeezes the water in the airbag out and replenishes it into the system.

[0003] However, the equipment structure of the prior art is complex, inconvenient to maintain, large in size, and expensive. The internal air bag of the expansion tank is easily damaged during welding, and welding slag is easy to enter the tank. The flange valve at the bottom of the tank body is easy to damage the air bag, and the water pressure regulation effect of the pressureless closed system is poor.

[0004] In addition, the expansion tank shell on the market has a rubber diaphragm that divides the internal space into two parts, the water storage chamber and the air storage chamber. Long-term water inflow will cause rust inside the tank, and the rust-mixed water will re-enter the system, affecting the water quality of the entire system. The pressure change in the air storage chamber will also affect the water storage chamber. Excessive pressure will also cause danger and is not practical. Utility Model Content

[0005] The purpose of the utility model is to provide a pressure-free closed heating system expansion device, which directly absorbs the expansion water of the system through an elastic capsule, adjusts the system pressure, ensures that the system water is isolated from the environment, reduces water shortage in the system due to evaporation, ensures stable operation of the system, has a simple structure, is easy to maintain, can discharge accumulated water in the device in time, prevents the device from rusting, and does not affect the expansion effect of the elastic capsule, ensures safety while improving the utilization rate of the device, and has better practicality.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0007] A pressureless closed heating system expansion device includes a shell with a hollow interior, an openable and closable top cover on the top of the shell, a connecting pipe connected to the bottom of the shell, an elastic capsule at the bottom of the shell, symmetrical fixing parts on the inner side wall of the shell, two fixing parts connected to the two sides of the elastic capsule respectively, the connecting pipe is connected to the interior of the elastic capsule, and a compression component connected to the top of the elastic capsule is provided in the shell, and the compression component can compress the elastic capsule to seal the connecting pipe.

[0008] Furthermore, the compression component is a counterweight.

[0009] Further, the counterweight is trapezoidal.

[0010] Further, the compression component is a spring, and two ends of the spring are connected with an inner top wall of the shell and a top of an outer side of the elastic capsule respectively.

[0011] Further, the shell is provided with a ventilation hole on the bottom of the shell and on the outer side of the elastic capsule.

[0012] Further, one end of the connecting pipe away from the shell is connected with a closed water tank through a pipeline.

[0013] Further, the mounting height of the fixing member is not less than half of the overall height of the shell.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses a shell and elastic capsule are arranged to realize gas-water separation, and the elastic capsule directly absorbs the expansion water of the system to adjust the system pressure, and the elasticity of the elastic capsule is good, and the elastic capsule can absorb enough expansion water, so that the system will not be over-pressured to cause danger, and the stable operation of the system is ensured, liquid only enters the elastic capsule through the connecting pipe, the shell does not directly contact the liquid, and the shell will not be affected, so that the device is not corroded, the shell is communicated with the atmosphere, and there is no need to additionally charge nitrogen, so that the expansion effect of the elastic capsule is not influenced, the expansion limit of the elastic capsule is greater, and the accumulated water in the device can be discharged in time, the utilization of the device is improved while safety is ensured, in addition, the expansion device has smaller volume than other expansion tanks under the same expansion amount, the overall structure is simple, maintenance is facilitated, and practicality is better. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a structural schematic diagram of the utility model. Figure 1

[0017] FIG. 3 is a schematic diagram of the expansion state of the elastic capsule in the shell of the utility model. Figure 2

[0018] FIG. 5 is a schematic diagram of the internal structure of embodiment 1 of the utility model. Figure 3

[0019] FIG. 7 is a schematic diagram of the internal structure of embodiment 2 of the utility model. Figure 4

[0020] FIG. 9 is a connecting structure schematic diagram of embodiment 3 of the utility model. Figure 5

[0021] Reference signs shown in the drawings:

[0022] 1, shell; 2, top cover; 3, connecting pipe; 4, elastic capsule; 5, fixing member; 6, counterweight; 7, spring; 8, ventilation hole; 9, closed water tank.​​​​​ DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined in this application.

[0024] The present invention is a pressure-free closed expansion device for a heating system. The main structure includes a hollow shell 1. The shell 1 is made of corrosion-resistant materials such as stainless steel, which can protect and fix the internal elastic capsule 4. It can be made into a circle or other shape according to the system requirements. The top of the shell 1 is provided with an openable top cover 2, which is convenient for observing and repairing the elastic capsule 4 inside the shell 1. The bottom of the shell 1 is connected with a connecting pipe 3, which is fixedly connected with the system water pipe through a thread. The bottom of the shell 1 is provided with an elastic capsule 4, which is sealed as a whole. Figure 2 As shown, the inner wall of the shell 1 is symmetrically provided with fixing members 5, and the fixing members 5 can be glued or hooked, so that the two sides of the elastic capsule 4 are respectively bonded or hung with two fixing members 5, so that the two sides of the elastic capsule 4 are in a state of being hung high on the inner wall of the shell 1, which plays a guiding role in the expansion of the elastic capsule 4, prompting the elastic capsule 4 to expand toward the top of the shell 1 after being filled with water. The connecting pipe 3 is connected to the inside of the elastic capsule 4, so that the water expanded by the system flows into the elastic capsule 4 through the connecting pipe 3, as shown in the attached figure. Figure 2 As shown, a compression component connected to the top of the elastic capsule 4 is provided in the shell 1. The compression component can be a trapezoidal counterweight 6 or a spring 7, which can compress the empty elastic capsule 4 to ensure the minimum water filling volume in the elastic capsule 4 during the system water injection period and maintain the maximum expansion water capacity during the operation of the expander. The compression component can compress the elastic capsule 4 to seal the connecting pipe 3, and the elastic capsule 4 needs to push the compression component upward after expanding with water, which also guides the expansion of the elastic capsule 4 to a certain extent.

[0025] Preferably, an air vent 8 is provided at the bottom of the shell 1, and the air vent 8 is located outside the elastic capsule 4, so that the interior of the shell 1 is connected to the atmospheric environment. When the elastic capsule 4 expands and contracts, the air in the shell 1 can be discharged or air can be sucked into the shell 1 in time through the air vent 8, so as to stabilize the internal pressure of the shell 1 and avoid the air pressure in the shell 1 affecting the expansion of the elastic capsule 4. The accumulated water in the device can also be discharged through the air vent 8 to prevent the expansion device from rusting. In this way, the maximum expansion range of the elastic capsule 4 is the entire internal space of the shell 1, so it can accommodate more expansion water of the heating system, so that the volume of the expansion device is smaller than that of other expansion tanks at the same expansion amount, and no additional nitrogen filling is required, and the structure is simpler.

[0026] Preferably, the connecting pipe 3 is connected with a closed water tank 9 at one end away from the shell 1, which can be used as a pressure stabilizing device and a water supplement device in the unit type closed heating system without pressure, saving space and having high utilization rate.

[0027] Preferably, the installation height of the fixing member 5 is not less than half of the overall height of the shell 1, which can better guide the expansion of the elastic capsule 4 and avoid the deviation of the elastic capsule 4 after expansion.

[0028] Embodiment 1: A closed heating system expansion device without pressure, comprising a hollow stainless steel shell 1, a top cover 2 provided on the top of the shell 1, a connecting pipe 3 connected with the system water pipe and fixed by screw thread at the bottom of the shell 1, an elastic capsule 4 provided in the shell 1, a gas pressure and flow sensor further provided on the elastic capsule 4 for monitoring the gas pressure and flow in the device, a fixing member 5 symmetrically provided on the inner side wall of the shell 1 and adhered to the elastic capsule 4, the installation height of the fixing member 5 being not less than half of the overall height of the shell 1, so that the elastic capsule 4 is hung on the inner wall of the shell 1, the connecting pipe 3 being in communication with the inside of the elastic capsule 4, a trapezoidal weight 6 provided in the shell 1 and connected with the top of the elastic capsule 4, the weight 6 being capable of pressing the elastic capsule 4 to block the connecting pipe 3, and a ventilation hole 8 provided at the bottom of the shell 1 and located outside the elastic capsule 4.

[0029] Embodiment 2: A closed heating system expansion device without pressure, which is different from Embodiment 1 in that a spring 7 is provided in the shell 1 and connected with the top of the elastic capsule 4, the spring 7 being connected with the inner top wall of the shell 1 and the top outside of the elastic capsule 4 at two ends, respectively, and capable of pressing the elastic capsule 4 to block the connecting pipe 3.

[0030] Embodiment 3: A closed heating system expansion device without pressure, which is based on Embodiment 1 or Embodiment 2, and further comprises a closed water tank 9 connected with the connecting pipe 3 at one end away from the shell 1, which can be used as a pressure stabilizing device and a water supplement device in the unit type closed heating system without pressure, saving space and having high utilization rate.

[0031] The patent is connected and fixed to the system water pipe by the connecting pipe 3 when in use, the expansion device can quickly enter the elastic capsule 4 of the expansion device after the expansion water generated by the non-pressure closed system such as electric heating system is heated, the elastic capsule 4 has good elasticity, the trapezoidal counterweight block 6 or spring 7 on the elastic capsule 4 cooperates with the fixing part 5 to make the elastic capsule 4 expand upward, balance the pressure of the system, ensure the safe operation of the system, and there is no need to fill nitrogen in the shell 1, the expansion limit of the elastic capsule 4 is larger, so that more expansion water of the heating system can be accommodated, the air pressure in the shell 1 is adjusted through the air hole 8, and the internal water is discharged, the elastic capsule 4 has a larger expansion limit, at the same time, the device is prevented from rusting, the whole device has simple structure, simple system operation, safe operation and maintenance, convenient maintenance, low cost, small area, saves space, high utilization, better practicality.

Claims

1. A pressureless closed heating system expansion device, comprising a hollow shell (1), a top cover (2) provided on the top of the shell (1), and a connecting pipe (3) connected to the bottom of the shell (1), characterized in that: An elastic capsule (4) is provided at the bottom of the shell (1), and fixing members (5) are symmetrically provided on the inner side wall of the shell (1). Both sides of the elastic capsule (4) are respectively connected to the two fixing members (5). The connecting pipe (3) is communicated with the interior of the elastic capsule (4). A compression member connected to the top of the elastic capsule (4) is provided in the shell (1), and the compression member can compress the elastic capsule (4) to seal the connecting pipe (3).

2. The expansion device for a non-pressure closed heating system according to claim 1, characterized in that: The compression component is a counterweight (6).

3. The expansion device for a pressure-free closed heating system according to claim 2, characterized in that: The counterweight (6) is trapezoidal.

4. The expansion device for a non-pressure closed heating system according to claim 1, characterized in that: The compression component is a spring (7), and the two ends of the spring (7) are respectively connected to the inner top wall of the shell (1) and the top of the outer side of the elastic capsule (4).

5. The expansion device for a pressure-free closed heating system according to claim 1, characterized in that: The bottom of the shell (1) is provided with an air vent (8), and the air vent (8) is located outside the elastic capsule (4).

6. The expansion device for a non-pressure closed heating system according to claim 1, characterized in that: One end of the connecting pipe (3) away from the housing (1) is connected to a closed water tank (9) via a pipeline.

7. The expansion device for a non-pressure closed heating system according to claim 1, characterized in that: The installation height of the fixing member (5) is not less than half the overall height of the housing (1).

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