CN219412838U - Vacuum isolation device - Google Patents

Abstract

The utility model provides a vacuum isolation device which comprises a vacuum tank, a shielding pump, a vacuum check valve and a constant pressure water tank. The utility model does not need to raise the investment, can ensure the comparison insurance, has simple operation when stopping the pump, and greatly reduces the medium leakage and backflow probability. The vacuum device is not required to be arranged at 10 meters, so that the manufacturing cost is reduced; the automatic vacuum isolation function can be realized without an electric control system, especially when the shielding pump fails, and the reliability is high.

Description

Vacuum isolation device

Technical Field

The utility model relates to the technical field of vacuum isolation equipment, in particular to a vacuum isolation device.

Background

Waste heat recovery by vacuum is a common technique, such as absorption heat pump, flash heat exchanger, etc. Because the waste heat is mostly water as a carrier, vacuum low-temperature evaporation is a better heat exchange mode. The vacuum heat exchange technology is adopted, negative pressure is arranged in the cavity, and a pump is needed when a medium is pumped out of the vacuum tank body, so that the outlet of the pump reaches positive pressure. However, the problem of the medium flowing back when the pump is stopped also needs to be considered.

The conventional technology for preventing the medium from flowing back has two modes, one is that a vacuum tank is arranged at a height of about 10 meters, and because the atmospheric pressure is only 10 meters of water column, even if power is lost, external water cannot flow back to the vacuum tank under the pressure of 10 meters of liquid column, so that vacuum is maintained; the second mode is to use a vacuum solenoid valve, close the solenoid valve before stopping the pump, and rapidly close the vacuum valve when the pump fails, so as to maintain vacuum.

The two modes have certain limitations, the mode of 10 meters high has the advantages of safety, no vacuum leakage even if power is lost, and the disadvantage of needing a site with enough height, greatly increasing the cost of the base when the equipment is heavier and having high influence on the cost; the electromagnetic valve adopted in the second mode has the advantages of simplicity, but is not safe, the electromagnetic valve has a certain failure rate, the electromagnetic valve cannot be guaranteed to be always closed, and the electromagnetic valve is operated after the pressure loss is detected under the condition of pump failure, and has a certain time interval and large liquid level fluctuation.

Disclosure of Invention

The utility model aims to provide a vacuum isolation device which can realize automatic vacuum isolation and has high reliability.

According to the purpose of the utility model, the vacuum isolation device comprises a vacuum tank, a shielding pump, a vacuum check valve and a constant pressure water tank, wherein an outlet of the vacuum tank is sequentially connected with the shielding pump and the vacuum check valve, and the constant pressure water tank is connected to the rear of the vacuum check valve.

Further, a pipeline pump is also connected to the rear of the vacuum check valve.

Further, a vacuum valve is arranged between the vacuum tank and the shielding pump.

Further, the vacuum valve is a manual vacuum valve.

Further, a manual valve is arranged between the vacuum check valve and the pipeline pump.

Further, the constant pressure water tank is connected between the manual valve and the pipe pump.

Further, the constant-pressure water tank is an open water tank or a water tank with pressure.

Further, the constant pressure water tank is connected with a pipeline behind the manual valve through a pipeline.

Further, the constant pressure water tank is directly connected with a pipeline behind the manual valve.

Further, the manual valve is a vacuum valve or an atmospheric valve.

The technical scheme of the utility model does not need to raise the investment, can ensure the comparison insurance, has simple operation when the pump is stopped, and greatly reduces the medium leakage and backflow probability. The vacuum device is not required to be arranged at 10 meters, so that the manufacturing cost is reduced; the automatic vacuum isolation function can be realized without an electric control system, especially when the shielding pump fails, and the reliability is high.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of embodiment 1 of the present utility model;

FIG. 2 is a schematic structural diagram of embodiment 2 of the present utility model;

FIG. 3 is a schematic structural diagram of embodiment 3 of the present utility model;

in the figure, 1, a vacuum tank; 2. a vacuum valve; 3. a shield pump; 4. a vacuum check valve; 5. a manual valve; 6. a pipeline pump; 7. a constant pressure water tank.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in figure 1 of the drawings,

the vacuum isolation device comprises a vacuum tank 1, wherein an outlet of the vacuum tank 1 is sequentially connected with a vacuum valve 2, a shielding pump 3, a vacuum check valve 4, a manual valve 5 and a pipeline pump 6, and a constant-pressure water tank 7 is connected to a pipeline between the manual valve 5 and the pipeline pump 6 through a pipeline.

The object of the utility model is to pump the liquid in the vacuum tank 1 to the outside, in order to avoid lifting, a two-stage pump series connection is used. The outlet of the vacuum tank 1 is connected with a vacuum valve 2 (manual), then is connected with a shielding pump 3, and the shielding pump 3 is connected with a vacuum check valve 4.

In this embodiment, the piping between the vacuum check valve 4 and the vacuum tank 1 is required to meet vacuum standards (full welded, integral vacuum leak detection). The vacuum check valve 4 does not need to realize vacuum isolation in a pipeline, only needs to keep vacuum between the valve body and an external contact surface, needs welding, and cannot have flange connection parts.

The pipeline behind the vacuum check valve 4 is an atmospheric pipeline, and flange connection can be adopted according to the normal pressure installation and inspection. A manual valve 5 is installed behind the vacuum check valve 4, and a constant pressure water tank 7 is arranged behind the vacuum check valve. The constant pressure water tank 7 can be an open water tank, a water tank with pressure or a water pump constant pressure mode.

The constant pressure water tank 7 is connected with the pipeline behind the manual valve 5 through a pipeline, or the main pipeline is directly connected with the water tank (the inlet is required to be below the liquid level). Subsequently, a conventional pipe pump 6 is installed again, and the water is pumped out after being pressurized.

When the utility model is in operation, the vacuum valve 2 and the manual valve 5 are opened, the shielding pump 3 is responsible for pressurizing the medium in the vacuum tank 1 to the pressure of the constant pressure water tank 7, and then the medium is pumped out through the pipeline pump 6.

If the pipeline pump 6 is stopped during the shutdown or failure, the vacuum pressure is not affected because the pipeline pump is in the normal pressure and positive pressure area; if the canned motor pump 3 is shut down, a pressure difference is formed between the external pipeline and the vacuum tank 1, water can flow back at first, but the effect of the vacuum check valve 4 is that water can be prevented from flowing back, water in the constant pressure water tank 7 can not flow out, air is prevented from entering the pipeline and then entering the vacuum tank 1 (the vacuum check valve 4 can only block water and can not block gas), and the vacuum check valve 4 and the constant pressure water tank 7 form a stable vacuum water seal effect.

In this embodiment, the vacuum valve 2 and the manual valve 5 are isolated when the canned pump 3 or the vacuum check valve 4 is overhauled.

In this embodiment, the canned motor pump 3 provides power, and the vacuum check valve 4 and the constant pressure water tank 7 provide water seal when unpowered. The shield pump 3 may be directly pressurized to a suitable pressure, or the shield pump 3 may be used to pressurize at least the pressure above the normal pressure and then the pressure may be pumped out by the pipe pump 6.

The constant pressure water tank 7 can be connected with the system through a pipeline or can be directly connected into the system pipeline. The direct access pipeline needs to be below the liquid level.

In this embodiment, a manual valve 5 is provided before the vacuum pump and after the vacuum check valve, wherein at least the valve before the vacuum pump is the vacuum valve 2.

In this embodiment, the vacuum check valve 4 is of an all-welded structure, and the manual valve 5 may be either the vacuum valve 2 or an atmospheric valve.

Example 2

As shown in the figure 2 of the drawings,

the present embodiment is basically the same in structure as embodiment 1, except that in this embodiment, the piping pump 6 is not installed, and the system power is directly supplied through the canned motor pump 3. Such a system is suitable for a process where the outlet pressure is not too high.

Example 3

As shown in the figure 3 of the drawings,

the present embodiment is basically the same as embodiment 1 in that in the present embodiment, a constant pressure water tank 7 is installed on a pipe between a manual valve 5 and a pipe pump 6, and water flows out after entering the constant pressure water tank 7. The tubing pump 6 may or may not be present depending on system parameter requirements.

The utility model discloses a vacuum isolation device which does not need to raise the investment and can ensure the comparison of insurance, the operation is simple when the pump is stopped, and the medium leakage and backflow probability is greatly reduced. The system of the utility model is simpler and more reliable. The vacuum device is not required to be arranged at 10 meters, so that the manufacturing cost is reduced; the automatic vacuum isolation function can be realized without an electric control system, especially when the shielding pump 3 fails, and the reliability is high.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (8)

1. The vacuum isolation device is characterized by comprising a vacuum tank, a shielding pump, a vacuum check valve and a constant pressure water tank, wherein an outlet of the vacuum tank is sequentially connected with the shielding pump and the vacuum check valve, and the constant pressure water tank is connected to the rear of the vacuum check valve; and a pipeline pump is further connected to the rear of the vacuum check valve, and a vacuum valve is arranged between the vacuum tank and the shielding pump.

2. The vacuum isolation device of claim 1, wherein the vacuum valve is a manual vacuum valve.

3. A vacuum isolation device as claimed in claim 1, wherein a manual valve is provided between the vacuum check valve and the conduit pump.

4. A vacuum isolation device as claimed in claim 3, wherein the constant pressure water tank is connected between the manual valve and the pipeline pump.

5. The vacuum isolation device of claim 1, wherein the constant pressure water tank is an open water tank or a pressurized water tank.

6. The vacuum isolation device of claim 4, wherein said constant pressure tank is connected to a conduit behind said manual valve by a conduit.

7. The vacuum isolation device of claim 4, wherein said constant pressure tank is directly connected to a conduit behind said manual valve.

8. The vacuum isolation device of claim 4, wherein said manual valve is a vacuum valve or an atmospheric valve.