Expansion valve capable of automatically balancing set pressure

Abstract

The expansion valve capable of automatically balancing the set pressure comprises an expansion valve body, a valve body is fixedly arranged on the end face of one side of the expansion valve body, a power head is arranged between the valve body and the expansion valve body, a connecting pipe is fixedly welded to one side of the outer end face of the valve body, and an outlet pipe is arranged on the lower wall of the valve body. According to the scheme, the valve tends to be closed when the evaporation pressure rises, at the moment, due to operation of the compressor, the evaporation pressure is reduced, the valve is in an open state, in the whole operation process, the valve is in dynamic balance, the evaporation pressure is kept to be about a set value, system pressure balance can be kept, local pipeline frosting is avoided, and the service life of the system is prolonged. Full-automatic welding is adopted for the power head, the yield is greatly improved, manual welding defects are greatly reduced, and the product quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion valves, in particular to an expansion valve capable of automatically balancing a set pressure. Background Art

[0002] The automatic expansion valve of the refrigeration system, also known as the hot gas bypass valve, is an important control component in the refrigeration system. It is used to adjust the energy output of the refrigeration system to ensure that the system can operate stably under various load conditions.

[0003] The working principle of the automatic expansion valve mainly relies on its internal control diaphragm. When the fluid pressure in the system changes, the control diaphragm will respond accordingly and adjust the valve opening to control the flow and pressure of the fluid. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides an expansion valve that can automatically balance a set pressure, thereby solving the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: an expansion valve that can automatically balance a set pressure, including an expansion valve, a valve body is fixedly provided on one end face of the expansion valve, a power head is provided between the valve body and the expansion valve, a connecting pipe is fixedly welded on one side of the outer end face of the valve body, an outlet pipe is provided on the lower wall of the valve body, the connecting pipe is connected to the outlet pipe, and a diaphragm is installed in the power head.

[0008] Preferably, an adjusting chamber is provided inside the top end of the expansion valve, and an adjusting nut is fixedly provided at the top end of the adjusting chamber.

[0009] Preferably, a telescopic connecting plate that can be extended or retracted is provided in the connecting pipe, a telescopic spring is fixedly connected between the telescopic connecting plate and the adjusting nut, and one end of the telescopic connecting plate abuts against the diaphragm.

[0010] Preferably, a telescopically movable connecting rod is provided in the expansion valve, and one end of the connecting rod is fixedly connected to the telescopic connecting plate.

[0011] Preferably, a regulating valve plate is fixedly provided in the outlet pipe, a movable telescopic regulating plate is provided in the outlet pipe, and a section of the telescopic regulating plate is fixedly connected to the connecting rod.

[0012] Preferably, an adjusting spring is fixedly connected between the telescopic adjusting plate and the adjusting valve plate.

[0013] (III) Beneficial effects

[0014] The utility model provides an expansion valve which can automatically balance the designed pressure and has the following beneficial effects:

[0015] 1. In this scheme, as the compressor runs, the evaporation pressure gradually decreases. When it decreases to below the set value, the bypass valve automatically opens, and the refrigerant fluid enters the evaporator through the valve. After the evaporator absorbs heat, the increase in evaporation pressure will cause the valve to tend to close. At this time, the evaporation pressure is reduced again due to the operation of the compressor, and the valve is open. During the entire operation process, the valve is in dynamic balance to keep the evaporation pressure around the set value.

[0016] 2. This solution can maintain the system pressure balance, thereby avoiding local pipeline frost and affecting subsequent work. The power head adopts fully automatic welding, which greatly improves the yield rate, greatly reduces manual welding defects, and ensures product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 3 This is a front view structural schematic diagram of the utility model;

[0020] Figure 4 For this utility model Figure 3 Cross-sectional view along the AA direction.

[0021] In the figure: 101, expansion valve; 102, power head; 103, valve body; 104, outlet pipe; 105, connecting pipe; 106, adjusting nut; 107, telescopic spring; 108, diaphragm; 109, connecting rod; 110, adjusting ball; 111, adjusting spring; 112, adjusting valve plate; 113, telescopic adjusting plate; 114, telescopic connecting plate; 115, adjusting chamber. DETAILED DESCRIPTION

[0022] The present invention provides an expansion valve that can automatically balance a predetermined pressure. Figure 1-4 As shown, it includes an expansion valve 101, a valve body 103 is fixedly provided on one end face of the expansion valve 101, a power head 102 is provided between the valve body 103 and the expansion valve 101, a connecting pipe 105 is fixedly welded to one side of the outer end face of the valve body 103, an outlet pipe 104 is provided on the lower wall of the valve body 103, the connecting pipe 105 is connected to the outlet pipe 104, and a diaphragm 108 is installed in the power head 102.

[0023] It should be further explained that the power head 102 adopts laser welding, which makes the welding position smoother and flatter, and the welding effect is more stable and firm.

[0024] Furthermore, an adjusting chamber 115 is provided inside the top end of the expansion valve 101 , and an adjusting nut 106 is fixedly provided at the top end of the adjusting chamber 115 .

[0025] It should be further explained that the adjusting nut can be installed at the top of the expansion valve 101 by using an Allen wrench and can be adjusted up and down.

[0026] Furthermore, a telescopic connecting plate 114 is provided in the connecting tube 105 , a telescopic spring 107 is fixedly connected between the telescopic connecting plate 114 and the adjusting nut 106 , and one end of the telescopic connecting plate 114 abuts against the diaphragm 108 .

[0027] It should be noted that when the diaphragm 108 senses pressure, it will deform, driving the connecting rod 114 to move up and down, thereby changing the internal diameter to achieve the effect of flow rate regulation.

[0028] Furthermore, a movable connecting rod 109 is provided in the expansion valve 101 , and one end of the connecting rod 109 is fixedly connected to the telescopic connecting plate 114 .

[0029] Furthermore, a regulating valve plate 112 is fixedly provided in the outlet pipe 104 , a movable telescopic regulating plate 113 is provided in the outlet pipe 104 , and a section of the telescopic regulating plate 113 is fixedly connected to the connecting rod 109 .

[0030] Furthermore, an adjusting spring 111 is fixedly connected between the telescopic adjusting plate 113 and the adjusting valve plate 112 .

[0031] When using this solution, the inlet of the outlet pipe 104 in the expansion valve 101 is connected to the outlet of the compressor, and the outlet of the connecting pipe 105 is connected to the inlet of the evaporator. Under such installation and adjustment, when the machine is not turned on, due to the high evaporation pressure, the regulating ball 110 in the outlet pipe 104 is in a closed state. After the machine is turned on, with the operation of the compressor, the evaporation pressure gradually decreases. When it decreases to below the set value, the expansion valve 101 automatically opens, and the refrigerant fluid enters the evaporator through the action of the valve. After the evaporator absorbs heat, the increase in evaporation pressure will cause the valve to tend to close. At this time, due to the operation of the compressor, the evaporation pressure is reduced again, and the valve is in an open state. During the entire operation process, the valve is in dynamic balance, keeping the evaporation pressure around the set value. The amplitude of the evaporation pressure fluctuation is related to the capacity of the valve, and is not affected by the change of the condensation pressure (or ambient temperature), and the evaporation pressure is stable.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An expansion valve capable of automatically balancing a set pressure, characterized in that: An expansion valve (101), wherein a valve body (103) is fixedly provided on one end surface of the expansion valve (101), a power head (102) is provided between the valve body (103) and the expansion valve (101), a connecting pipe (105) is fixedly welded to one side of the outer end surface of the valve body (103), an outlet pipe (104) is provided on the lower wall of the valve body (103), the connecting pipe (105) is connected to the outlet pipe (104), and a diaphragm (108) is installed in the power head (102).

2. An expansion valve capable of automatically balancing a set pressure according to claim 1, characterized in that: An adjusting chamber (115) is provided inside the top end of the expansion valve (101), and an adjusting nut (106) is fixedly provided at the top end of the adjusting chamber (115).

3. An expansion valve capable of automatically balancing a set pressure according to claim 2, characterized in that: A telescopic connecting plate (114) is provided in the connecting pipe (105), a telescopic spring (107) is fixedly connected between the telescopic connecting plate (114) and the adjusting nut (106), and one end of the telescopic connecting plate (114) is in contact with the diaphragm (108).

4. An expansion valve capable of automatically balancing a set pressure according to claim 3, characterized in that: A connecting rod (109) is provided in the expansion valve (101), and one end of the connecting rod (109) is fixedly connected to the telescopic connecting plate (114).

5. An expansion valve capable of automatically balancing a set pressure according to claim 4, characterized in that: A regulating valve plate (112) is fixedly provided in the outlet pipe (104), a telescopic regulating plate (113) is provided in the outlet pipe (104), and a section of the telescopic regulating plate (113) is fixedly connected to the connecting rod (109).

6. An expansion valve capable of automatically balancing a set pressure according to claim 5, characterized in that: An adjusting spring (111) is fixedly connected between the telescopic adjusting plate (113) and the adjusting valve plate (112).

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