Starting protection oil return mechanism

Abstract

The utility model provides a starting protection oil return mechanism which comprises an injection chamber, a branch pipe used for being connected with the exhaust end of a compressor in a water chilling unit is installed at the closed end of the injection chamber, a connecting pipe used for being connected with a condenser in the water chilling unit is installed on the outer surface of the injection chamber, and a detachable reducer pipe is installed at the open end of the injection chamber. One end of the branch pipe extends into the reducer pipe, a detachable inner cylinder is installed at the end, away from the injection chamber, of the reducer pipe, the two ends of the inner cylinder are open, the inner cylinder is sleeved with an outer cylinder in sliding connection with the inner cylinder, a sealing sleeve is installed on the side, close to the open end, in the outer cylinder, and the inner cylinder is wrapped with the sealing sleeve. A pipe connector used for being connected with the air suction end of a compressor in the water chilling unit is installed at the closed end of the outer cylinder, and a limiting piece is installed between the inner cylinder and the outer cylinder, and the reducer pipe has the advantages that when the reducer pipe is replaced, a pipeline connected to the air suction end of the compressor in the water chilling unit does not need to be detached.

Description

TECHNICAL FIELD

[0001] The utility model relates to a starting protection oil return mechanism and belongs to the field of water chiller units. BACKGROUND

[0002] The high-speed airflow discharged from the compressor exhaust end of the water chiller unit enters the ejector, a negative pressure is formed in the ejector, and the oil in the condenser enters the injection chamber and reenters the compressor under the action of the negative pressure, thereby achieving the purpose of oil return protection. The ejector comprises an injection chamber and a reducer pipe installed at one end of the injection chamber. One end of the branch pipe installed in the injection chamber needs to extend into the reducer pipe, that is, the reducer pipe and the branch pipe overlap. Since the other end of the reducer pipe is connected to the compressor suction end through a pipeline, it is necessary to replace the reducer pipe with different inner diameters. Since the reducer pipe and the branch pipe overlap, the pipeline connected to the compressor suction end needs to be removed to provide space for dismounting the reducer pipe. This method requires the removal of the bolts connecting the pipeline and the compressor suction end, which increases the number of bolts to be dismounted and reduces the efficiency of replacing the reducer pipe. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model aims to provide a starting protection oil return mechanism to solve the problems in the background art. The utility model does not need to remove the pipeline connected to the compressor suction end of the water chiller unit when replacing the reducer pipe.

[0004] To achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme: a starting protection oil return mechanism, comprising an injection chamber, one end of the injection chamber is open, a branch pipe for connecting the compressor exhaust end of the water chiller unit is installed at the closed end of the injection chamber, a connecting pipe for connecting the condenser of the water chiller unit is installed on the outer surface of the injection chamber, a detachable reducer pipe is installed at the open end of the injection chamber, one end of the branch pipe extends into the reducer pipe, a detachable inner cylinder is installed at the end of the reducer pipe away from the injection chamber, both ends of the inner cylinder are open, an outer cylinder in sliding connection with the inner cylinder is sleeved on the inner cylinder, a sealing sleeve is installed on the side of the outer cylinder close to the open end thereof, the sealing sleeve is wrapped around the inner cylinder, a pipe joint for connecting the compressor suction end of the water chiller unit is installed at the closed end of the outer cylinder, and a limiting piece is installed between the inner cylinder and the outer cylinder.

[0005] Further, the limiting piece comprises a screw rod, the outer side of the inner cylinder is provided with the screw rod, the outer surface of one end of the inner cylinder close to the injection chamber and the outer surface of one end of the outer cylinder away from the pipe joint are both connected and fixed with connecting ears, round holes are formed in the opposite faces of the two connecting ears, the two ends of the screw rod respectively penetrate through the two round holes, and nuts are arranged on both sides of the screw rod in the length direction of the screw rod, the nuts are in threaded connection with the screw rod.

[0006] Further, the first flange is connected and fixed with the second flange through a plurality of bolts, and the first sealing gasket is arranged between the first flange and the second flange.

[0007] Further, the third flange is connected and fixed with the fourth flange through a plurality of bolts, and the second sealing gasket is arranged between the third flange and the fourth flange.

[0008] Further, the support ring is connected and fixed on one side of the outer cylinder close to the open end, and the sealing sleeve is adhered to the support ring through glue.

[0009] Further, the fifth flange is connected and fixed on one end of the branch pipe outside the ejector chamber, the sixth flange is arranged on one end of the pipe joint away from the outer cylinder, and the seventh flange is arranged on one end of the connecting pipe away from the ejector chamber.

[0010] The utility model discloses the beneficial effects of:

[0011] 1. The high-speed airflow discharged from the compressor exhaust end of the water chiller flows into the reducing pipe through the branch pipe, the airflow increases in speed when passing through the middle part of the reducing pipe due to the reducing pipe being thick at both ends and thin in the middle, thereby forming negative pressure in the ejector chamber, and the oil liquid in the condenser enters the ejector chamber and reenters the compressor under the action of the negative pressure, achieving the purpose of oil return protection.

[0012] 2. When replacing the reducing pipe, the reducing pipe and the inner cylinder and the ejector chamber are separated, then the inner cylinder is moved to be retracted into the outer cylinder, thereby expanding the spacing between the ejector chamber and the outer cylinder, then the reducing pipe is moved to move towards the outer cylinder until the one end of the branch pipe moves out of the reducing pipe, thereby facilitating the disassembly of the reducing pipe, without the need to disassemble the pipeline connected to the suction end of the compressor in the water chiller to provide space for the separation of the reducing pipe and the branch pipe, reducing the number of bolt disassembly, and improving the replacement efficiency of the reducing pipe.

[0013] 3. After the inner cylinder is connected with the reducing pipe, the two ends of the screw rod are respectively penetrated through the round holes in the two connecting ears, then the two nuts on the two ends of the screw rod are twisted, and the two nuts on the ends of the screw rod are tightly attached to the connecting ears, at this time, the screw rod, the nut and the connecting ear jointly limit the relative position of the inner cylinder and the outer cylinder, and the stability of the structure is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 Structure diagram of the starting protection oil return mechanism of the utility model;

[0016] Figure 2 For Figure 1 Enlarged view at A;

[0017] Figure 3 For Figure 1 Enlarged view at B;

[0018] Figure 4 Sectional view of the starting protection oil return mechanism of the utility model;

[0019] Figure 5 Stereogram of the inner cylinder of the starting protection oil return mechanism of the utility model;

[0020] Figure 6 Stereogram of the outer cylinder of the starting protection oil return mechanism of the utility model;

[0021] In the figure: 1 - ejection chamber, 2 - branch pipe, 3 - connecting pipe, 4 - reducing pipe, 5 - inner cylinder, 6 - outer cylinder, 7 - pipe joint, 8 - sealing sleeve, 9 - screw rod, 10 - first flange, 11 - first sealing washer, 12 - second flange, 13 - third flange, 14 - fourth flange, 15 - second sealing washer, 16 - connecting lug, 17 - nut, 18 - supporting ring, 19 - circular hole. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0023] Please refer to Figure 1 and Figure 4 The utility model provides a technical scheme: a starting protection oil return mechanism, comprising an ejection chamber 1, the ejection chamber 1 one end is open, the ejection chamber 1 closed end is installed with the branch pipe 2 for connecting the compressor exhaust end in the water chiller unit, through the fifth flange of fixed connection at the branch pipe 2 in the outside of the ejection chamber 1 one end, it is convenient to make the branch pipe 2 with the compressor exhaust end in the water chiller unit is connected.

[0024] Refer to Figure 1 , Figure 2 and Figure 4The outer surface of the injection chamber 1 is provided with a connecting pipe 3 for connecting the condenser in the water chilling unit, the seventh flange is arranged on the end of the connecting pipe 3 away from the injection chamber 1, so that the connecting pipe 3 is connected with the condenser in the water chilling unit, the variable diameter pipe 4 is arranged on the opening end of the injection chamber 1, one end of the branch pipe 2 extends into the variable diameter pipe 4, the first flange 10 is arranged on the opening end of the injection chamber 1, the second flange 12 matched with the first flange 10 is fixedly connected with the end of the variable diameter pipe 4 close to the injection chamber 1, so that the first flange 10 is fixedly connected with the second flange 12 through a plurality of bolts, the assembly of the injection chamber 1 and the variable diameter pipe 4 is completed, the first sealing washer 11 is arranged between the first flange 10 and the second flange 12, so that the sealing property between the injection chamber 1 and the variable diameter pipe 4 is improved, the high-speed airflow discharged from the exhaust end of the compressor in the water chilling unit flows into the variable diameter pipe 4 through the branch pipe 2, the airflow speed increases when the airflow passes through the middle part of the variable diameter pipe 4 due to the fact that the variable diameter pipe 4 is thick at both ends and thin in the middle, so that the negative pressure is formed in the injection chamber 1, the oil liquid in the condenser enters the injection chamber 1 and reenters the compressor under the action of the negative pressure, so that the oil return protection is realized.

[0025] Referring to Figures 1-6 The end of the variable diameter pipe 4 away from the injection chamber 1 is provided with the detachable inner cylinder 5, both ends of the inner cylinder 5 are open, the third flange 13 is arranged on the end of the variable diameter pipe 4 close to the inner cylinder 5, the fourth flange 14 matched with the third flange 13 is fixedly connected with the end of the inner cylinder 5 outside the outer cylinder 6, so that the third flange 13 is fixedly connected with the fourth flange 14 through a plurality of bolts, the assembly of the inner cylinder 5 and the variable diameter pipe 4 is completed, the second sealing washer 15 is arranged between the third flange 13 and the fourth flange 14, so that the sealing property between the inner cylinder 5 and the variable diameter pipe 4 is improved, the outer cylinder 6 is sleeved with the inner cylinder 5 in a sliding connection, the sealing sleeve 8 is arranged on the side of the inner cylinder 6 close to the opening end, the supporting ring 18 is fixedly connected with the side of the inner cylinder 6 close to the opening end, the sealing sleeve 8 is adhered to the supporting ring 18 through glue, the supporting ring 18 supports the sealing sleeve 8, so that the sealing sleeve 8 is wrapped on the inner cylinder 5, the sealing property between the inner cylinder 5 and the outer cylinder 6 is improved, the pipe joint 7 for connecting the suction end of the compressor in the water chilling unit is arranged on the closed end of the outer cylinder 6, the sixth flange is arranged on the end of the pipe joint 7 away from the outer cylinder 6, so that the pipe joint 7 is connected with the pipeline on the suction end of the compressor, when the variable diameter pipe 4 is replaced, the variable diameter pipe 4 and the inner cylinder 5 and the injection chamber 1 are separated, then the inner cylinder 5 is moved, so that the inner cylinder 5 is retracted into the outer cylinder 6, the spacing between the injection chamber 1 and the outer cylinder 6 is enlarged, then the variable diameter pipe 4 is moved, so that the variable diameter pipe 4 is moved to the outer cylinder 6, until the one end of the branch pipe 2 moves out of the variable diameter pipe 4, so that the variable diameter pipe 4 is conveniently disassembled and assembled, the pipeline connected with the suction end of the compressor in the water chilling unit does not need to be disassembled to provide the space for the separation of the variable diameter pipe 4 and the branch pipe 2, the number of bolts to be disassembled is reduced, and the replacement efficiency of the variable diameter pipe 4 is improved.

[0026] Referring toFigure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The outer side of the inner cylinder 5 is provided with a screw rod 9, the outer surface of the end of the inner cylinder 5 close to the ejecting chamber 1 and the outer surface of the end of the outer cylinder 6 away from the pipe joint 7 are both connected and fixed with a connecting lug 16, the opposite surfaces of the two connecting lugs 16 are both provided with a round hole 19, the two ends of the screw rod 9 respectively penetrate through the two round holes 19, the two sides of the screw rod 9 in the length direction are both provided with a nut 17, the nut 17 is screwed on the screw rod 9, after the inner cylinder 5 is connected with the reducing pipe 4, the two ends of the screw rod 9 respectively penetrate through the round holes 19 on the two connecting lugs 16, then the two nuts 17 on the two ends of the screw rod 9 are screwed, the two nuts 17 on the ends of the screw rod 9 are both closely attached to the connecting lugs 16, at this time, the screw rod 9, the nut 17 and the connecting lug 16 jointly limit the relative position of the inner cylinder 5 and the outer cylinder 6, and the stability of the structure is improved.

[0027] Although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A start-up protection oil return mechanism, comprising an ejector chamber (1), characterized in that: The ejector chamber (1) is open at one end. A branch pipe (2) for connecting to the compressor exhaust end in the chiller unit is installed at the closed end of the ejector chamber (1). A connecting pipe (3) for connecting to the condenser in the chiller unit is installed on the outer surface of the ejector chamber (1). A detachable reducing pipe (4) is installed at the open end of the ejector chamber (1). One end of the branch pipe (2) extends into the reducing pipe (4). A detachable reducing pipe is installed at the end of the reducing pipe (4) away from the ejector chamber (1). The inner cylinder (5) is unloaded. Both ends of the inner cylinder (5) are open. An outer cylinder (6) is fitted on the inner cylinder (5) and slidably connected to the inner cylinder (5). A sealing sleeve (8) is installed on the side of the outer cylinder (6) near its open end. The sealing sleeve (8) wraps around the inner cylinder (5). A pipe joint (7) for connecting to the suction end of the compressor in the chiller unit is installed at the closed end of the outer cylinder (6). A limiting component is installed between the inner cylinder (5) and the outer cylinder (6).

2. The start-up protection return oil mechanism according to claim 1, characterized in that: The limiting component includes a screw (9). The screw (9) is provided on the outer side of the inner cylinder (5). Connecting ears (16) are fixedly connected to the outer surface of the inner cylinder (5) near the ejector chamber (1) and the outer surface of the outer cylinder (6) away from the pipe joint (7). The two connecting ears (16) are provided with round holes (19) on opposite sides. The two ends of the screw (9) pass through the two round holes (19) respectively. Nuts (17) are provided on both sides of the two connecting ears (16) along the length direction of the screw (9). The nuts (17) are threaded onto the screw (9).

3. The start-up protection return oil mechanism according to claim 1, characterized in that: The ejector chamber (1) is equipped with a first flange (10) at its open end. The reducer (4) is connected and fixed to a second flange (12) that mates with the first flange (10) at one end near the ejector chamber (1). The first flange (10) is connected and fixed to the second flange (12) by a plurality of bolts. A first sealing gasket (11) is installed between the first flange (10) and the second flange (12).

4. The start-up protection return oil mechanism according to claim 1, characterized in that: The reducing pipe (4) is equipped with a third flange (13) at one end near the inner cylinder (5). The inner cylinder (5) is connected and fixed to a fourth flange (14) that cooperates with the third flange (13) at one end outside the outer cylinder (6). The third flange (13) is connected and fixed to the fourth flange (14) by multiple bolts. A second sealing gasket (15) is installed between the third flange (13) and the fourth flange (14).

5. The start-up protection oil return mechanism according to claim 1, characterized in that: A support ring (18) is fixedly connected to one side of the outer cylinder (6) near its opening end, and the sealing sleeve (8) is glued to the support ring (18).

6. The start-up protection return oil mechanism according to claim 1, characterized in that: The branch pipe (2) is connected to a fifth flange at one end outside the ejector chamber (1), the pipe joint (7) is equipped with a sixth flange at one end away from the outer cylinder (6), and the connecting pipe (3) is equipped with a seventh flange at one end away from the ejector chamber (1).

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