AU2017100461A4 - Defrosting valve - Google Patents

Abstract

Abstact A defrosting valve, comprising: a valve body (2) provided with a valve core (5) therein and an upper lid (1) thereon, and a pushing piston (3) is provided in the valve core (5); a return tension spring (4) is sleeved on the lower portion of the upper lid (1), the upper end of the return tension spring (4) is connected to the upper lid (1), and the lower end of the return tension spring (4) is connected to the lower end of the pushing piston (3); a lower table board (12) is provided at the lower portion in the valve body (2), a flow channel inlet (9) is provided on the upper lid (1), the side wall of the valve body (2) is arranged with a bidirectional flow channel opening (10), and the lower end of the valve body (2) is arranged with a flow channel outlet (11). The defrosting valve is simple and reasonable in structure and long in service life, and improves the heating efficiency of an air conditioner.

Description

Defrosting Valve Technical Field 2017100461 27 Apr 2017 [0001] The present invention relates to a defrosting valve and belongs to the technical field of air-conditioners. The defrosting valve is used for defrosting control over evaporators during heating of air-conditioners.

Background Art [0002] During heating of air-conditioners, evaporators frost over, reduction of heating efficiency can be caused when frost is too thick, and therefore the evaporators need to be defrosted. According to an existing defrosting method, overall defrosting of the evaporators is controlled by changing the airflow direction through a four-way valve, a condenser is changed into an evaporator during defrosting, heating is forced to stop, and then the heating efficiency of the air-conditioners is reduced.

Summary of the Invention [0004] The present invention aims to overcome the defects of the prior art. When evaporators are defrosted, a segmented defrosting mode is adopted, that is to say, during defrosting, when a group of evaporators is defrosted, the other group of evaporators continue to work, heating of air-conditioners does not stop, and then the efficiency of the air-conditioners is improved greatly and the comfort level of the air-conditioners is increased too. The defrosting valve is simple and reasonable in structure and long in service life.

[0005] The objective of the present invention can be realized through the following measures: [0006] Compared with the prior art, the present invention has the positive effects that the structure is simple and reasonable, the service life is long, segmented defrosting of the evaporators can be achieved, heating does not stop during defrosting, and then the heating efficiency of the air-conditioners is improved. 1

Brief Description of the Drawings 2017100461 27 Apr 2017 [0007] FIG. 1 is a structural diagram of a first embodiment of the present invention; [0008] FIG. 2 is a working condition schematic view of FIG. 1; [0009] FIG. 3 is a structural diagram of a second embodiment of the present invention; [0010] FIG. 4 is a working condition schematic view of FIG. 3; [0011] FIG. 5 is a structural diagram of a third embodiment of the present invention; [0012] FIG. 6 is a working condition schematic view of FIG. 5; [0013] FIG. 7 is a structural diagram of a fourth embodiment of the present invention; [0014] FIG. 8 is a working condition schematic view of FIG. 7; [0015] FIG. 9 is an enlarged view of a lower valve element part of FIG. 7; [0016] FIG. 10 is a structural diagram of a fifth embodiment of the present invention; [0017] FIG. 11 is a working condition schematic view of FIG. 10; [0018] FIG. 12 is a heating state view when the present invention is applied to an air-conditioner heating system; [0019] FIG. 13 is a defrosting state view when the present invention is applied to an air-conditioner heating system.

Detailed Description of the Invention [0020] The principle and features of the present invention will be explained by making reference to the accompanying drawings. However, selected illustrative embodiments are only used for the purpose of description of the present invention and do not limit the scope of the invention in any way.

[0021] Embodiment 1: A defrosting valve (refer to FIG. 1-FIG. 2) comprises a valve body 2, a valve element 5 is arranged in the valve body 2, an upper lid 1 is arranged on the valve body 2, a propelling piston 3 is arranged in the valve element 5, and the diameter of the propelling piston 3 is smaller than that of the valve element 5; the propelling piston 3 is inverse-T-shaped, and the upper portion of the propelling piston 3 is inserted into an inner cavity of the upper lid 1, so as to decrease the sectional area of pressure and reduce the acting force of the airflow on the valve element 5. The lower portion of the upper lid 1 is sleeved with a return tension spring 4, the upper end of the return tension spring 4 is connected with the upper lid 1, the lower end of the return tension spring 4 is connected with the lower end of the propelling piston 3, and in this way, the size of the valve body is reduced. A lower deck 12 is arranged on the lower portion of the interior of the valve body 2, the 2 upper lid 1 is provided with a runner inlet 9, a bidirectional runner port 10 is formed in the side wall of the valve body, and a runner outlet 11 is formed in the lower end of the valve body 2. 2017100461 27 Apr 2017 [0022] When the defrosting valve does not conduct defrosting, the runner inlet 9 is free of pressure, the valve element 5 is located on the upper portion of the valve body under the action of the return tension spring 4, and at the moment, the bidirectional runner port 10 and the runner outlet 11 are communicated.

[0023] When gas with a high temperature and high pressure exists at the runner inlet 9, the propelling piston 3 moves downwards under pressure and drives the valve element 5 to move downwards at the same time; when the lower surface of the valve element is combined with the lower deck 12 of the valve body, the bidirectional runner port 10 and the runner outlet 11 are closed, the gas with a high temperature and high pressure at the runner inlet 9 flows out through the bidirectional runner port 10, and then defrosting is started.

[0024] When the gas with a high temperature and high pressure at the runner inlet 9 disappears, pressure on the propelling piston 3 disappears, the valve element 5 restores automatically under the tensioning action of the return tension spring 4, the bidirectional runner port 10 and the runner outlet 11 are communicated, and an air-conditioner continues heating work.

[0025] Due to the requirement of the operating environment, small flow resistance between the runner outlet 11 and the bidirectional runner port 10 is preferred, the resistance of fluid from the runner inlet 9 to the bidirectional runner port 10 has no effect on performances, so the caliber of the bidirectional runner port 10 and the caliber of the runner outlet 11 are both larger than the caliber of the runner inlet 9 by at least one international grade, the minimum differential is 3mm, and maximum differential is not limited. The operating environment also results in the downward movement distance of the valve element 5 being smaller than twice the diameter of the runner port 10, in other words, when the runner outlet 11 is closed by the valve element 5, the upper edge of the valve element 5 is located in the middle of the runner port 10, total opening is not needed, and in this way, the fluid requirement of the runner inlet 9 can be met and the size of the valve body can be reduced.

[0026] To guarantee that the runner inlet 9, the runner port 10 and the runner outlet 11 are not all communicated, the height of the valve element 5 is larger than the diameter of the bidirectional runner port 10, in this way, it is guaranteed that only the runner inlet 9 and the runner port 10 are communicated, or only the runner port 10 and the runner outlet 11 are communicated, and there is no way for the three ports to be all communicated.

[0027] Due to the adoption of the structure that the valve element 5 is pulled by the tension spring to be located at the upper end of the valve body, no obstacle exists at the bidirectional runner port 10 3 and the runner outlet 11, resistance from the bidirectional runner port 10 to the runner outlet 11 is extremely low, pressure loss is reduced, and the efficiency of the air-conditioner is improved. 2017100461 27 Apr 2017 [0028] Pressure at the runner inlet 9 directly acts on the propelling piston 3, due to the fact that the diameter of the propelling piston 3 is smaller than that of the valve element 5, the stressed area is reduced, thrust on the valve element 5 is lowered, impact of the valve element 5 on the lower deck 12 is reduced, and as a result, the service life of the valve element 5 is prolonged, and influences of impact vibration caused by the valve body 2 on a pipeline system of the air-conditioner are also reduced.

[0029] When the defrosting valve is applied to a heating system of the air-conditioner (refer to FIG. 12 and FIG. 13), two defrosting valves are connected with defrosting electromagnetic valves 13, evaporators 14, a distribution valve 15, an expansion valve 16, a condenser 17, a compressor 18 and a four-way reversing valve 19 as shown in the figures.

[0030] When normal heating work is conducted and defrosting is not needed (refer to FIG. 12), the defrosting electromagnetic valves 13 are switched off, refrigerant airflow flows to the runner outlet 11 from the bidirectional runner port 10 and then returns to the compressor, and the air-conditioner conducts normal heating work.

[0031] When defrosting is needed (refer to FIG. 12), one of the defrosting electromagnetic valves 13 is switched on, the other defrosting electromagnetic valve 13 is switched off, airflow with a high temperature and high pressure flows in through the runner inlet 9 to push the piston 3 to move downwards, then the valve element 5 is driven to move downwards to be sealed with the lower deck 12 of the valve body so that the runner outlet 11 is cut off and the runner inlet 9 and the bidirectional runner port 10 are communicated, and hot air flows to the evaporators 14 through the bidirectional runner port 10 from the runner inlet 9 so as to defrost the evaporators 14; when defrosting ends, the corresponding defrosting electromagnetic valve 13 is switched off, gas with a high temperature and high pressure at the runner inlet 9 disappears, the valve element 5 is made to restore under the action of the return tension spring 4, the bidirectional runner port 10 and the runner outlet 11 are communicated, and the evaporators 14 of the air-conditioner continues to work.

[0032] Similarly, when the other group of evaporators need to be defrosted, one of the defrosting electromagnetic valves 13 is switched off, the other defrosting electromagnetic valve 13 is switched on, and the other group of evaporators 14 are defrosted.

[0033] Embodiment 2: A defrosting valve (refer to FIG. 3-FIG. 4) has a structure and principle basically identical with those of embodiment 1. The difference lies in that the propelling piston 3 is line-shaped; when the defrosting valve is applied to a small-caliber air-conditioner, due to the small 4 pipeline diameter, generated impact force is small, and therefore the upper portion of the propelling piston can be omitted. 2017100461 27 Apr 2017 [0034] Embodiment 3: A defrosting valve (refer to FIG. 5-FIG. 6) has a structure and principle basically identical with those of embodiment 1. The difference lies in that a sealing gasket 8 is arranged at the lower end of the valve element 5.

[0035] Embodiment 4: A defrosting valve (refer to FIG. 7-FIG. 9) has a structure and principle basically identical with those of embodiment 1.

[0036] The difference lies in that in certain specific occasions, a through hole 21 can be formed in the valve element 5, and a runner 20 is directly communicated with the runner outlet 11 through the through hole 21.

[0037] When the through hole 21 exists, the following improvement can also be added: the runner 20 is arranged in the propelling piston 3, a small valve element 6 is arranged in the runner and located on the lower portion of the propelling piston 3, the small valve element 6 is sleeved with a spring 7, the upper end of the spring 7 is connected with the small valve element 6, the lower end of the spring 7 is connected with the valve element 5, the through hole 21 is formed in the valve element 5, and the lower end of the small valve element 6 corresponds to the through hole 21.

[0038] In certain occasions, two-stage differential pressure is required to switch on the defrosting valve. During automatic reduction of internal pressure after defrosting of the evaporators ends, the small valve element 6 is opened under the elasticity of the spring 7 when the internal pressure is reduced to the opening pressure of the small valve element 6, the pressure of the bidirectional runner port 10 is transferred to the through hole 21 through the runner 20, and then the pressure of the evaporators is relieved; when the internal pressure is further reduced to the opening pressure of the large valve element 5, the large valve element 5 moves upwards to restore under the action of the return tension spring 4, and at the moment, the bidirectional runner port 10 and the runner outlet 11 are communicated, and the air-conditioner continues heating work.

[0039] Embodiment 5: A defrosting valve (refer to FIG. 10-FIG. 11) has a structure and principle basically identical with those of embodiment 1. The difference lies in that the upper lid 1 of the defrosting valve is connected with the corresponding defrosting electromagnetic valve 13, the runner inlet 9 of the upper lid 1 is connected with an air outlet of the electromagnetic valve into a whole, and then a valve group is formed.

[0040] The various aspects and embodiments disclosed herein are only preferred embodiments of the present invention and are not intended to be limiting. Any modifications, equivalent replacements 5 and improvements within the spirit and principle of the disclosure should fall within the scope of protection of the present invention. 2017100461 27 Apr 2017 [0041] Throughout this specification and the claims that follow unless the context requires otherwise, the words 'comprise' and 'include' and variations such as 'comprising' and 'including' will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.

[0042] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that such prior art forms part of the common general knowledge of the technical field. 6

Claims (10)

1. Claims

   1. A defrosting valve, characterized by comprising a valve body (2), a valve element (5) is arranged in the valve body (2), an upper lid (1) is arranged on the valve body (2), a propelling piston (3) is arranged in the valve element (5), the lower portion of the upper lid (1) is sleeved with a return tension spring (4), the upper end of the return tension spring (4) is connected with the upper lid (1), the lower end of the return tension spring (4) is connected with the lower end of the propelling piston (3), a lower deck (12) is arranged on the lower portion of the interior of the valve body (2), the upper lid (1) is provided with a runner inlet (9), a bidirectional runner port (10) is formed in the side wall of the valve body (2), and a runner outlet (11) is formed in the lower end of the valve body (2).
2. 2. The defrosting valve according to claim 1, characterized in that the propelling piston (3) is inverse-T-shaped, and the upper portion of the propelling piston (3) is inserted into an inner cavity of the upper lid (1).
3. 3. The defrosting valve according to claim 1, characterized in that the propelling piston (3) is lineshaped.
4. 4. The defrosting valve according to claim 1, characterized in that the caliber of the bidirectional runner port (10) and the caliber of the runner outlet (11) are both larger than the caliber of the runner inlet (9) by at least one international grade.
5. 5. The defrosting valve according to claim 1, characterized in that the distance between the lower deck (12) and the lower edge of the runner port (10) is smaller than the diameter of the runner port (10).
6. 6. The defrosting valve according to claim 1, characterized in that the height of the valve element (5) is larger than the diameter of the bidirectional runner port (10).
7. 7. The defrosting valve according to claim 1 or 6, characterized in that a sealing gasket (8) is arranged at the lower end of the valve element (5).
8. 8. The defrosting valve according to claim 7, characterized in that a through hole (21) is formed in the valve element (5).
9. 9. The defrosting valve according to claim 8, characterized in that a runner (20) is arranged in the propelling piston (3), a small valve element (6) is arranged in the runner and located on the lower portion of the propelling piston (3), the small valve element (6) is sleeved with a spring (7), the upper end of the spring (7) is connected with the small valve element (6), the lower end of the spring (7) is connected with the valve element (5), and the lower end of the small valve element (6) corresponds to a through hole (21).
10. 10. The defrosting valve according to claim 1, characterized in that the upper lid (1) of the defrosting valve is connected with a defrosting electromagnetic valve (13), and the runner inlet (9) of the upper lid (1) is connected with an air outlet of the electromagnetic valve into a whole.