CN201281505Y - Single-body bidirectional restriction sleeve - Google Patents

Abstract

The utility model relates to a single bidirectional throttle short tube, which is characterized in that: the short throttle tube is a single tube, and the flow cross-sectional area of the inlet A at one end is larger than the flow cross-sectional area of the inlet B at the other end, wherein the inlet A is a refrigeration unit. Inlet B is the inlet of refrigerant during heating, and inlet B is the inlet of refrigerant during heating. Its advantages are: no one-way valve, reducing production costs; reducing welding joints, reducing hidden dangers of leakage; completely avoiding vibration and noise generated by the one-way valve.

Description

Single bi-directional throttle short tube

technical field

The utility model relates to a single-type two-way throttling short pipe, in particular to a single-piece bidirectional short-throttle pipe in an air-conditioning and refrigeration system performing cooling and heating operations.

Background technique

Refrigerating equipment such as cooling and heating dual-purpose air conditioners, when performing cooling and heating operations, the throttling pressure difference requirements for the two operating modes are different. At present, the capillary throttling pressure difference is proportional to the length, so that the length of the refrigerant flowing through the capillary is different during the cooling and heating operation. The structure shown in Figure 1 is usually used in design. When cooling operation, the refrigerant enters from the A end of the capillary tube 1 and flows out directly through the E end of the one-way valve 2 after being throttled by the capillary tube 1 . During the heating operation, the refrigerant enters from the E end of the one-way valve 2. Due to the blocking effect of the one-way valve 2, the refrigerant enters through the D end of the capillary 3, and then reaches the C end after being throttled by the capillary 3 once. After being throttled twice by capillary 1, it flows out from its A end. The main problem of adopting this structure is that a one-way valve is added in the throttling system, which not only increases the material cost, but also increases the possibility of welding joint leakage and noise generated by the one-way valve.

Utility model content

The purpose of the utility model is to provide a single-type two-way throttling short tube without a one-way valve to replace the traditional capillary throttling or short tube throttling structure for cooling and heating. Regardless of whether the refrigeration system is in cooling or heating operation, the same single short tube is used for throttling, so as to simplify the structure and reduce the cost.

In order to achieve the above object, the utility model is realized in this way, which is a single bidirectional throttle short tube, characterized in that: the short throttle tube is a single tube, and the flow cross-sectional area of the inlet A at one end is larger than the inlet B at the other end The cross-sectional area of the flow, where the inlet A is the inlet of the refrigerant during cooling, and the inlet B is the inlet of the refrigerant during heating.

The inlet A of the short throttle pipe is a trumpet-shaped mouth, and the inlet B is also a trumpet-shaped mouth.

Compared with the prior art, the utility model has the following advantages:

(1) No one-way valve, reducing production cost;

(2) Reduce welding joints and reduce leakage hazards;

(3) Completely avoid the vibration noise generated by the one-way valve.

Description of drawings

Fig. 1 is the structural representation of prior art;

Fig. 2 is a schematic structural view of the utility model.

specific implementation plan

Since the flow resistance of the refrigerant is proportional to the flow velocity during the throttling process, and the influence of the flow velocity on the resistance is much greater than that of the length on the resistance, so this characteristic can be used to change the flow velocity of the refrigerant in the refrigeration system during cooling and heating. To change its throttling pressure difference to meet the different throttling pressure difference requirements of the refrigeration system in cooling and heating operations. Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

As shown in Figure 1, it is a single bidirectional throttle short tube. The utility model is characterized in that: the short throttle tube 1 is a single tube, and the flow cross-sectional area of the inlet A at one end is larger than that of the inlet B at the other end. The cross-sectional area, where the inlet A is the inlet of the refrigerant during cooling, and the inlet B is the inlet of the refrigerant during heating. In this embodiment, the inlet A of the short throttle tube 1 is a trumpet-shaped mouth, and the inlet B thereof is also a trumpet-shaped mouth.

When in use, during the capillary throttling process, the refrigerant gradually changes from a liquid phase to a gas-liquid two-phase, and the closer to the rear end, the greater the gas ratio (that is, the dryness), the higher the flow rate, and the throttling pressure The faster the descent. When the refrigeration system is in refrigeration operation, the refrigerant flows in from the inlet A with a large flow cross-sectional area. Because the flow cross-sectional area of the inlet A is large, the refrigerant is in a liquid phase and a small dryness state in its flow, and the flow velocity is small, saving energy. Flow pressure drops slowly. When the refrigerant continues to enter the middle section at a small flow rate for throttling, its throttling pressure drops relatively slowly. When the refrigerant continues to enter the vicinity of the inlet B end, the refrigerant will be congested, and its pressure drop will be less affected by the structural size and flow cross-sectional area of the inlet B, so the overall throttling pressure drop of the refrigerant during cooling operation is small . When the refrigeration system is in heating operation, the refrigerant flows in from the inlet B with a small flow cross-sectional area. Because the flow cross-sectional area of the inlet B is small, the flow velocity of the refrigerant in it is relatively large, and the throttling pressure drops greatly, so that the refrigerant flows in When a large dryness enters the middle section for throttling, due to the increase of the refrigerant dryness, the flow rate increases, so the throttling pressure in the middle section drops rapidly, so that the overall throttling pressure of the refrigerant in the heating operation The drop is larger. Therefore, different throttling pressure difference requirements of the refrigeration system in refrigeration and heating operation are met.

Since refrigeration systems of different sizes produce different cooling capacity and heating capacity, in order to meet this need, it can be realized in the following way: For refrigeration systems with large cooling capacity and heating capacity, the refrigerant flow rate increases, and the refrigerant flow in the short tube As the average flow velocity increases, the influence of the flow area on the throttling resistance is intensified. Therefore, it can be realized by increasing the aperture diameter of the middle section of the short throttle tube and reducing the ratio of the opening sizes of the inlet A and the inlet B. For refrigeration systems with small cooling capacity and heating capacity, the refrigerant flow rate decreases, the average flow velocity in the short tube decreases, and the influence of the flow area on the throttling resistance is reduced. Therefore, it can be reduced by reducing the diameter of the middle section of the short throttle tube , to increase the ratio of the opening size of inlet A and inlet B to achieve.

In order to further reduce the cost, the short throttle tube can be directly placed in the refrigerant circulation pipe or component between the high pressure system and the low pressure system of the refrigeration system, or the internal structural shape of the above short tube can be processed on the stop valve and other components. Play a two-way throttling role.

Claims (2)

1. A single bidirectional throttle short tube, characterized in that: the short throttle tube (1) is a single tube, and the flow cross-sectional area of the inlet A at one end is greater than the flow cross-sectional area of the inlet B at the other end, where the inlet A is Inlet B is the inlet of refrigerant during cooling, and inlet B is the inlet of refrigerant during heating. 2. The single-body two-way throttle short tube according to claim 1, characterized in that: the inlet A of the short throttle tube (1) is a trumpet-shaped mouth or other shapes, and its inlet B is also a trumpet-shaped mouth or other shapes.

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