Low-pressure bypass device and refrigerating system provided with same

Abstract

The low-pressure bypass device comprises a valve body, a bypass inlet and a bypass outlet are formed in the valve body, a first valve element is installed in the valve body in a sliding mode, a first elastic component is arranged between the first valve element and the valve body, and a first piston is installed in the valve body in a sliding mode. The first piston is connected with the first valve element through a first elastic component, an adjusting bolt is rotatably installed on the first piston, and the adjusting bolt is installed on the valve body in a threaded mode. The valve has the advantages that the first piston is driven by rotating the adjusting bolt to move along the valve body, and the first valve element is pushed by the first elastic component to move along the valve body; the distance between the first valve element and the bypass outlet is adjusted, so that the extrusion degree of the first elastic component is adjusted when the first valve element communicates with the bypass outlet, the device is suitable for being used under different liquid pressure intensities, the use range is expanded, and adjustment is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration systems, and particularly relates to a low-pressure bypass device and a refrigeration system equipped with the device. Background Art

[0002] At present, in a refrigeration unit system, a liquid supply pipeline is provided between the condenser and the evaporator to realize the transportation of liquid between the condenser and the evaporator.

[0003] Patent document No. 201320583422.7 discloses a bypass liquid supply device for a refrigeration system, comprising a condenser, an evaporator and a liquid supply pipeline arranged between the condenser and the evaporator, wherein the liquid supply pipeline comprises a stop valve, a drying filter, a liquid sight glass and an expansion valve connected in sequence, characterized in that a bypass branch is also connected in parallel to the expansion valve, and the bypass branch comprises a solenoid valve and a throttle valve connected in series. The beneficial effects of the utility model are that it is simple, practical and low in cost.

[0004] However, the use of solenoid valves and throttle valves to achieve flow regulation in the liquid supply pipeline requires high precision of the solenoid valves and throttle valves, and the solenoid valves and throttle valves need to be repaired regularly, which has high maintenance costs. At the same time, it is inconvenient to adjust the pressure of the flowing liquid.

[0005] Therefore, in view of the shortcomings of the above-mentioned scheme in actual production and implementation, it is revised and improved. At the same time, in the spirit and concept of seeking excellence, with the assistance of professional knowledge and experience, and after many ingenuity and experiments, the present utility model is created, and a low-pressure bypass device for a refrigeration system is provided to solve the problem. Utility Model Content

[0006] The utility model provides a low-pressure bypass device and a refrigeration system equipped with the device, which solves the problems in the prior art.

[0007] The technical solution of the utility model is implemented as follows: a low-pressure bypass device comprises a valve body, the valve body is provided with a bypass inlet and a bypass outlet, a first valve core is slidably mounted in the valve body, a first elastic component is arranged between the first valve core and the valve body, the first valve core corresponds to the bypass outlet, a first piston is slidably mounted in the valve body, the first piston is connected to the first valve core through a first elastic component, an adjusting bolt is rotatably mounted on the first piston, the adjusting bolt is threadedly mounted on the valve body, and rotating the adjusting bolt drives the first piston to move along the valve body, which will push the first valve core to move along the valve body through the first elastic component;

[0008] During use of the above technical solution: the first piston is driven to move along the valve body by rotating the adjusting bolt, and the first valve core is pushed to move along the valve body through the first elastic component, thereby adjusting the distance between the first valve core and the bypass outlet, thereby adjusting the degree of squeezing of the first elastic component when the first valve core is connected to the bypass outlet. It is suitable for use with different liquid pressures, expands the scope of use, and is convenient for adjustment.

[0009] As a preferred technical solution: a limit frame is fixedly arranged in the valve body, the limit frame and the bypass outlet correspond to the first valve core, and the first piston is driven to move along the valve body by rotating the adjusting bolt to compress the first elastic component between the first piston and the first valve core;

[0010] The first valve core is prevented from moving away from the first elastic component by the limiting frame, and the compression amount of the first elastic component is adjusted to be suitable for use with different liquid pressures, thereby improving the stability of use.

[0011] As a preferred technical solution: one end of the first elastic component is welded to the first valve core, and the other end of the first elastic component is welded to the first piston.

[0012] As a preferred technical solution: a third flange is installed on the valve body through bolt and nut sealing, a screw hole is opened on the third flange, and the adjusting bolt is threadedly installed in the screw hole;

[0013] By installing the adjusting bolt on the third flange and sealingly connecting the third flange to the valve body through bolts and nuts, the first valve core can be easily disassembled and installed, thereby improving the efficiency of maintenance and replacement and reducing the replacement cost.

[0014] As a preferred technical solution: a transparent window is provided on the valve body, and scale markings are provided on the transparent window;

[0015] The moving distance of the first piston can be observed through the transparent window and compared with the scale mark to facilitate constant pressure adjustment and improve the accuracy of adjustment.

[0016] As a preferred technical solution: a guide groove is provided on the valve body, a guide block is fixedly provided on the first piston, and the guide block is slidably installed in the guide groove;

[0017] The first piston drives the guide block to slide along the guide groove, thereby improving the stability of the first valve core when moving and improving the accuracy of the bypass device.

[0018] As a preferred technical solution: it is characterized in that a second valve core is slidably installed on the valve body, a second elastic component is arranged between the second valve core and the first valve core, a first pipeline is arranged on the second valve core, a first outlet is arranged on the valve body, the first pipeline corresponds to the first outlet, the second valve core corresponds to the bypass outlet, and the first pipeline is connected to the first outlet through the second elastic component.

[0019] As a preferred technical solution: a limit rod is movably installed on the second elastic component, the limit rod is fixedly connected to the second valve core, a gap is reserved between the limit rod and the first valve core, and the limit rod contacts the first valve core when the second valve core pushes the first pipeline to be misaligned with the first outlet;

[0020] When the flowing liquid has normal pressure, the second valve core is pushed to compress the second elastic component, so that the first outlet and the bypass device are in a sealed state. When low-pressure liquid flows through, the second elastic component pushes the second valve core to move to connect the first pipeline with the first outlet, and the low-pressure liquid refluxes through the first pipeline and the first outlet. When high-pressure liquid flows through, the second valve core drives the limit rod to push the first valve core to move, so that the bypass inlet is connected to the bypass outlet, and the high-pressure liquid flows out through the bypass outlet, realizing the function of low-pressure reflux and high-pressure discharge, thereby improving the safety performance of the equipment.

[0021] A refrigeration system comprises a condenser and an evaporator, wherein the condenser and the evaporator are connected through a main pipeline, an expansion valve is arranged on the main pipeline, and the low-pressure bypass device is installed in parallel with the expansion valve on the main pipeline;

[0022] When the main pipeline pressure is high, the liquid flowing through it supplies liquid to the evaporator through the low-pressure bypass device and the expansion valve at the same time, thereby increasing the liquid supply. Different numbers of low-pressure bypass devices can be installed in parallel as needed to improve the accuracy and flow rate.

[0023] As a preferred technical solution: the bypass inlet of the low-pressure bypass device is fixedly and sealedly connected to the main pipeline, the bypass outlet of the low-pressure bypass device is fixedly and sealedly connected to a liquid storage tank, and the liquid storage tank is connected to the condenser;

[0024] When the main pipeline pressure is high, the liquid flowing through it flows into the liquid storage tank through the low-pressure bypass device, ensuring that the liquid supply between the condenser and the evaporator is maintained at a constant value, thereby improving the safety and stability of use.

[0025] During use, the above technical solution: realizes automated control.

[0026] After adopting the above technical solution, the beneficial effects of the utility model are:

[0027] 1. By rotating the adjusting bolt to drive the first piston to move along the valve body, the first elastic component will push the first valve core to move along the valve body, and the distance between the first valve core and the bypass outlet can be adjusted, so as to adjust the degree of squeezing the first elastic component when the first valve core is connected to the bypass outlet. This is suitable for use with different liquid pressures, expands the scope of use, and is convenient for adjustment;

[0028] 2. The first valve core is prevented from moving away from the first elastic component by the limiting frame, and the compression amount of the first elastic component is adjusted to be suitable for use with different liquid pressures, thereby improving the stability of use;

[0029] 3. By installing the adjusting bolts on the third flange and sealingly connecting the third flange to the valve body through bolts and nuts, it is convenient to disassemble and install the first valve core, improve the efficiency of maintenance and replacement, and reduce the replacement cost;

[0030] 4. When the flowing liquid has normal pressure, the second valve core is pushed to compress the second elastic component, so that the first outlet and the bypass device are in a sealed state. When low-pressure liquid flows through, the second elastic component pushes the second valve core to move to connect the first pipeline with the first outlet, and the low-pressure liquid returns through the first pipeline and the first outlet. When high-pressure liquid flows through, the second valve core drives the limit rod to push the first valve core to move, so that the bypass inlet is connected with the bypass outlet, and the high-pressure liquid flows out through the bypass outlet, realizing the function of low-pressure return and high-pressure discharge, thereby improving the safety performance of the equipment;

[0031] 5. When the main pipeline pressure is high, the liquid flowing through it will be supplied to the evaporator through the low-pressure bypass device and the expansion valve at the same time to increase the liquid supply. Different numbers of low-pressure bypass devices can be installed in parallel as needed to improve the accuracy and flow rate.

[0032] 6. When the main pipeline pressure is high, the liquid flowing through it flows into the liquid storage tank through the low-pressure bypass device, ensuring that the liquid supply between the condenser and the evaporator is maintained at a constant value, thereby improving the safety and stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a three-dimensional diagram of the utility model;

[0035] Figure 2 It is the front view of the utility model;

[0036] Figure 3 It is a cross-sectional view of the utility model;

[0037] Figure 4 It is an exploded view of the utility model;

[0038] Figure 5 This is a diagram showing the effect of using the first embodiment of the utility model;

[0039] Figure 6 This is a low-pressure reflux effect diagram of the second embodiment of the utility model;

[0040] Figure 7 It is a cross-sectional view of the second embodiment of the utility model;

[0041] Figure 8 This is a high-pressure effect diagram of the second embodiment of the utility model;

[0042] Fig. 9 This is a schematic diagram of the installation of the third embodiment of the present utility model;

[0043] Fig.10 This is a schematic diagram of the installation of the fourth embodiment of the present utility model;

[0044] Fig.11 This is a schematic diagram of the installation of the sixth embodiment of the present utility model;

[0045] In the figure, 1, condenser; 2, evaporator; 3, main pipeline; 4, stop valve; 5, expansion valve; 6, bypass mechanism; 601, valve body; 602, bypass outlet; 603, bypass inlet; 604, first flange; 605, transparent window; 606, scale mark; 607, second flange; 608, third flange; 609, bolt and nut; 610, adjusting bolt; 611, first piston; 612, first elastic component; 613, first valve core; 614, limiting frame; 615, screw hole; 616, guide groove; 617, guide block; 618, second valve core; 619, arc baffle; 620, first outlet; 621, first pipeline; 622, second piston; 623, second elastic component; 624, limiting rod; 7, liquid storage tank; 8, reflux pipe; DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] Embodiment 1: Figures 1 to 5As shown, a low-pressure bypass device includes a bypass mechanism 6, the bypass mechanism 6 includes a valve body 601, the valve body 601 is provided with a bypass inlet 603 and a bypass outlet 602, a first valve core 613 is slidably installed in the valve body 601, a first elastic component 612 is provided between the first valve core 613 and the valve body 601, the first valve core 613 corresponds to the bypass outlet 602, a first piston 611 is slidably installed in the valve body 601, the first piston 611 and the first valve core 613 are connected through the first elastic component 612, an adjusting bolt 610 is rotatably installed on the first piston 611, the adjusting bolt 610 is threadedly installed on the valve body 601, and the rotating adjusting bolt 610 drives the first piston 611 to move along the valve body 601, and the first valve core 613 is pushed to move along the valve body 601 through the first elastic component 612;

[0048] By rotating the adjusting bolt 610 to drive the first piston 611 to move along the valve body 601, the first elastic component 612 will push the first valve core 613 to move along the valve body 601, and the distance between the first valve core 613 and the bypass outlet 602 can be adjusted, thereby adjusting the degree of squeezing of the first elastic component 612 when the first valve core 613 is connected to the bypass outlet 602. This is suitable for use with different liquid pressures, expands the scope of use, and is convenient for adjustment.

[0049] A limit frame 614 is fixedly disposed in the valve body 601. The limit frame 614 is annular. The limit frame 614, the bypass outlet 602 and the first valve core 613 correspond to each other. The adjusting bolt 610 is rotated to drive the first piston 611 to move along the valve body 601 to compress the first elastic component 612 between the first piston 611 and the first valve core 613.

[0050] The first valve core 613 is prevented from moving away from the first elastic component 612 by the limiting frame 614. By adjusting the compression amount of the first elastic component 612, it is suitable for use with different liquid pressures, thereby improving the stability of use.

[0051] The first elastic component 612 is a return spring, one end of which is welded to the first valve core 613 , and the other end of which is welded to the first piston 611 .

[0052] A third flange 608 is sealed and mounted on the valve body 601 through bolts and nuts 609. A screw hole 615 is provided on the third flange 608. An adjusting bolt 610 is threadedly mounted in the screw hole 615.

[0053] Specifically: a first flange 604 is welded on the valve body 601, and the first flange 604 is connected to the bypass inlet 603, so as to facilitate the installation of the valve body 601; a second flange 607 is welded on the valve body 601, and the second flange 607 corresponds to the third flange 608, and through holes are provided on the second flange 607 and the third flange 608, and bolts and nuts 609 are passed through the through holes to fix and seal the second flange 607 and the third flange 608;

[0054] During use: the second flange 607 and the third flange 608 are fixedly sealed and connected by passing the bolts and nuts 609 through the through holes, the adjusting bolt 610 is threadedly installed in the screw hole 615, and the adjusting bolt 610 is rotated to drive the first piston 611 to slide along the valve body 601, and the movement of the first valve core 613 is blocked by the limit frame 614, thereby squeezing the first elastic component 612. By adjusting the compression amount of the first elastic component 612, it is suitable for use with different liquid pressures. When high-pressure liquid flows through, the first valve core 613 is pushed to move along the valve body 601 and compress the first elastic component 612, so that the bypass inlet 603 is connected to the bypass outlet 602.

[0055] A transparent window 605 is provided on the valve body 601, and a scale mark 606 is provided on the transparent window 605; a guide groove 616 is provided on the valve body 601, and a guide block 617 is fixedly provided on the first piston 611, and the guide block 617 is slidably installed in the guide groove 616, and the number of the guide groove 616 is at least one, and the number of the guide grooves 616 is preferably four, and the four guide grooves 616 are evenly distributed along the circumference of the valve body 601, and the guide block 617 corresponds to the guide groove 616;

[0056] During use: the first piston 611 drives the guide block 617 to slide along the guide groove 616, thereby improving the stability of the first valve core 613 during movement and improving the accuracy of the bypass device. The moving distance of the first piston 611 is observed through the transparent window 605 and compared with the scale mark 606, so as to facilitate constant pressure adjustment and improve the accuracy of the adjustment.

[0057] Embodiment 2: Figures 6 to 8 As shown, a second valve core 618 is slidably installed on the valve body 601, a second elastic component 623 is arranged between the second valve core 618 and the first valve core 613, a first pipe 621 is arranged on the second valve core 618, a first outlet 620 is arranged on the valve body 601, the first pipe 621 corresponds to the first outlet 620, the second valve core 618 corresponds to the bypass outlet 602, and the first pipe 621 is connected to the first outlet 620 through the second elastic component 623.

[0058] A limit rod 624 is movably mounted on the second elastic component 623, and the limit rod 624 is fixedly connected to the second valve core 618. A gap is reserved between the limit rod 624 and the first valve core 613. When the second valve core 618 pushes the first pipe 621 to misalign with the first outlet 620, the limit rod 624 contacts the first valve core 613.

[0059] Specific: such as Figure 6 As shown, the first pipe 621 is L-shaped, one end of the first pipe 621 is connected to the bypass inlet 603, when the first pipe 621 moves to the first outlet 620, the first pipe 621 is connected to the first outlet 620, when the first pipe 621 is away from the first outlet 620, the other end of the first pipe 621 is sealed by the inner wall of the valve body 601, the second valve core 618 is welded with an arc baffle 619 for blocking the first outlet 620, a second piston 622 is slidably installed in the valve body 601, the second piston 622 is welded to the first pipe 621, the second piston 622 is welded to the limit rod 624, the second elastic component 623 is a spring, one end of the spring is welded to the first valve core 613, and the other end of the spring is welded to the second piston 622;

[0060] During use: when the flowing liquid has normal pressure, the second valve core 618 is pushed to compress the second elastic component 623, so that the first outlet 620 and the bypass device are in a sealed state; when low-pressure liquid flows through, the second elastic component 623 pushes the second valve core 618 to move and connect the first pipe 621 with the first outlet 620, and the low-pressure liquid refluxes through the first pipe 621 and the first outlet 620; when high-pressure liquid flows through, the second valve core 618 drives the limit rod 624 to push the first valve core 613 to move, so that the bypass inlet 603 is connected with the bypass outlet 602, and the high-pressure liquid flows out through the bypass outlet 602, realizing the function of low-pressure reflux and high-pressure discharge, thereby improving the safety performance of the equipment.

[0061] Embodiment 3: Fig. 9 As shown, a refrigeration system includes a condenser 1 and an evaporator 2, the condenser 1 is connected to the evaporator 2 through a main pipeline 3, an expansion valve 5 is provided on the main pipeline 3, a low-pressure bypass device is installed in parallel with the expansion valve 5 on the main pipeline 3, a stop valve 4 is provided on the main pipeline 3, the stop valve 4 is located at one end close to the condenser 1, a bypass inlet 603 of the bypass mechanism 6 is connected to the main pipeline 3 between the stop valve 4 and the expansion valve 5, and a bypass outlet 602 is connected to the main pipeline 3 close to the evaporator 2;

[0062] When the pressure of the main pipeline 3 is relatively high, the liquid flowing through it supplies liquid to the evaporator 2 through the low-pressure bypass device and the expansion valve 5 at the same time, thereby increasing the liquid supply amount. Different numbers of low-pressure bypass devices are installed in parallel as needed to improve the accuracy and flow rate of use.

[0063] Embodiment 4: Different numbers of low-pressure bypass devices are installed in parallel as required, and the rest of the structure is the same as that of embodiment 3.

[0064] Embodiment 5: Fig.10 As shown, the bypass inlet 603 of the low-pressure bypass device is fixedly sealed and connected to the main pipeline 3, and the bypass outlet 602 of the low-pressure bypass device is fixedly sealed and connected to the liquid storage tank 7, and the liquid storage tank 7 is connected to the condenser 1. The remaining structure is the same as that of the third embodiment.

[0065] When the pressure of the main pipeline 3 is too high, the liquid flowing through it flows into the liquid storage tank 7 through the low-pressure bypass device, ensuring that the liquid supply between the condenser 1 and the evaporator 2 is kept at a constant value, thereby improving the safety and stability of use.

[0066] Example 6: Fig.11 As shown, according to the low-pressure bypass device described in Example 2, the first outlet 620 is connected to the condenser 1, and the remaining structures are the same as those in Example 3. When low-pressure liquid flows through, the second elastic component 623 pushes the second valve core 618 to move to connect the first pipe 621 with the first outlet 620, and the low-pressure liquid refluxes through the first pipe 621 and the first outlet 620. When high-pressure liquid flows through, the second valve core 618 drives the limiting rod 624 to push the first valve core 613 to move, so that the bypass inlet 603 is connected to the bypass outlet 602, and the high-pressure liquid flows out through the bypass outlet 602, thereby realizing the function of low-pressure reflux and high-pressure discharge, thereby improving the safety performance of the equipment.

[0067] The working principle of the utility model is as follows: the second flange 607 and the third flange 608 are fixedly sealed and connected by passing the bolt nut 609 through the through hole, the adjusting bolt 610 is threadedly installed in the screw hole 615, the adjusting bolt 610 is rotated to drive the first piston 611 to slide along the valve body 601, and the movement of the first valve core 613 is blocked by the limit frame 614, thereby squeezing the first elastic component 612, and by adjusting the compression amount of the first elastic component 612, it is suitable for use with different liquid pressures. When the high-pressure liquid flows through, the first valve core 613 is pushed to move along the valve body 601 and compress the first elastic component 612, so that the bypass inlet 603 is connected with the bypass outlet 602;

[0068] The first piston 611 drives the guide block 617 to slide along the guide groove 616, thereby improving the stability of the first valve core 613 when moving, and improving the accuracy of the bypass device. The moving distance of the first piston 611 is observed through the transparent window 605 and compared with the scale mark 606, so as to facilitate the constant pressure adjustment and improve the accuracy of the adjustment.

[0069] When the pressure of the main pipeline 3 is relatively high, the liquid flowing through it supplies liquid to the evaporator 2 through the low-pressure bypass device and the expansion valve 5 at the same time, thereby increasing the liquid supply amount. Different numbers of low-pressure bypass devices are installed in parallel as needed to improve the accuracy and flow rate of use.

[0070] In the description of the present utility model, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-pressure bypass device, comprising a valve body (601), wherein the valve body (601) is provided with a bypass inlet (603) and a bypass outlet (602), wherein a first valve core (613) is slidably mounted in the valve body (601), wherein a first elastic component (612) is provided between the first valve core (613) and the valve body (601), and wherein the first valve core (613) corresponds to the bypass outlet (602), wherein: A first piston (611) is slidably mounted inside the valve body (601). The first piston (611) is connected to the first valve core (613) via a first elastic component (612). An adjusting bolt (610) is rotatably mounted on the first piston (611). The adjusting bolt (610) is threadedly mounted on the valve body (601). Rotating the adjusting bolt (610) drives the first piston (611) to move along the valve body (601), which in turn pushes the first valve core (613) to move along the valve body (601) via the first elastic component (612).

2. A low-pressure bypass device according to claim 1, characterized in that: A limit frame (614) is fixedly arranged inside the valve body (601); the limit frame (614), the bypass outlet (602) and the first valve core (613) correspond to each other; the adjusting bolt (610) is rotated to drive the first piston (611) to move along the valve body (601) to compress the first elastic component (612) between the first piston (611) and the first valve core (613).

3. A low-pressure bypass device according to claim 2, characterized in that: One end of the first elastic component (612) is welded to the first valve core (613), and the other end of the first elastic component (612) is welded to the first piston (611).

4. A low-pressure bypass device according to claim 3, characterized in that: The valve body (601) is sealed with a third flange (608) by means of bolts and nuts (609). The third flange (608) is provided with a screw hole (615), and the adjusting bolt (610) is threadedly installed in the screw hole (615).

5. A low-pressure bypass device according to claim 4, characterized in that: The valve body (601) is provided with a transparent window (605), and the transparent window (605) is provided with scale markings (606).

6. A low-pressure bypass device according to claim 5, characterized in that: The valve body (601) is provided with a guide groove (616), and the first piston (611) is fixedly provided with a guide block (617), and the guide block (617) is slidably installed in the guide groove (616).

7. A low-pressure bypass device according to any one of claims 1 to 6, characterized in that: A second valve core (618) is slidably mounted on the valve body (601); a second elastic component (623) is provided between the second valve core (618) and the first valve core (613); a first pipe (621) is provided on the second valve core (618); a first outlet (620) is provided on the valve body (601); the first pipe (621) corresponds to the first outlet (620); the second valve core (618) corresponds to the bypass outlet (602); and the first pipe (621) is connected to the first outlet (620) via the second elastic component (623).

8. A low-pressure bypass device according to claim 7, characterized in that: A limit rod (624) is movably mounted on the second elastic component (623), and the limit rod (624) is fixedly connected to the second valve core (618). A gap is reserved between the limit rod (624) and the first valve core (613). When the second valve core (618) pushes the first pipeline (621) and the first outlet (620) to be misaligned, the limit rod (624) contacts the first valve core (613).

9. A refrigeration system, characterized in that: A low-pressure bypass device as described in any one of claims 1 to 8 is installed, comprising a condenser (1) and an evaporator (2), the condenser (1) and the evaporator (2) are connected through a main pipeline (3), an expansion valve (5) is provided on the main pipeline (3), and the low-pressure bypass device and the expansion valve (5) are installed in parallel on the main pipeline (3).

10. A refrigeration system according to claim 9, characterized in that: The bypass inlet (603) of the low-pressure bypass device is fixedly and sealedly connected to the main pipeline (3), and the bypass outlet (602) of the low-pressure bypass device is fixedly and sealedly connected to a liquid storage tank (7), and the liquid storage tank (7) is connected to the condenser (1).

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