Expansion valve for air conditioner heat exchange system

Abstract

The utility model relates to the technical field of expansion valves, and discloses an expansion valve for an air conditioner heat exchange system, which comprises a valve body, a valve core, a valve plug, a pressure tank, a temperature wrap, a diaphragm, a push rod and the like, a movable cavity is arranged in the push rod, and a through hole is arranged in the push rod and positioned on the upper side of the movable cavity. And the top of the inner cavity of the movable cavity is fixedly connected with a heat conducting sheet. According to the utility model, the temperature sensed by the temperature sensing bulb is transmitted into the pressure box, so that the temperature acts on the heat conducting sheet, and then the mercury in the movable cavity is promoted to move downwards through temperature rise, so that the mercury pushes the piston plate to move downwards, the piston plate drives the ejector rod to move downwards, and the downwards-moving ejector rod directly acts on the valve plug, thereby pushing the valve plug to move downwards. The valve plug drives the valve element to move downwards, the liquid inlet pipe is promoted to be communicated with the liquid outlet pipe, the expansion valve can be rapidly used for adjustment after the temperature sensing bulb senses the temperature, and the reaction time of adjustment of the expansion valve is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion valves, in particular to an expansion valve for an air-conditioning heat exchange system. Background Art

[0002] The thermal expansion valve controls the refrigerant flow entering the evaporator by sensing the superheat of the gaseous refrigerant at the evaporator outlet. According to different balancing methods, thermal expansion valves are divided into external balanced and internal balanced types. In industrial cooling equipment, an external balanced thermal expansion valve is generally used. The diaphragm on the upper part of the pressure chamber only has diaphragm pressure. The spring force and evaporation pressure of the adjustment spring are located below the diaphragm. When the three are in balance, the diaphragm pressure is equal to the spring force plus the evaporation pressure. When the heat load of the evaporator increases, the outlet superheat is high and the diaphragm pressure increases. At this time, the diaphragm pressure is greater than the spring force plus the evaporation pressure. The combined force causes the push rod and the valve core to move downward, the thermal expansion valve opens more, and the refrigerant flow increases proportionally. Conversely, the thermal expansion valve opens less and the refrigerant flow decreases proportionally.

[0003] During use, the existing expansion valve often controls the pressure inside the pressure box through a temperature sensing package, thereby changing the diaphragm pressure. Since the temperature transmission path is relatively long, after the temperature is transmitted into the pressure box, the temperature must be used to cause the gas inside the pressure box to expand, so that the push rod can push the valve plug and the valve core to move. This reduces the reaction speed of the expansion valve, thereby affecting the regulation of the expansion valve. Moreover, after the expansion valve is regulated, the resetting speed of the valve core and the valve plug is relatively slow, which affects the sensitivity of the expansion valve regulation. Utility Model Content

[0004] In view of the shortcomings of existing expansion valves, the utility model provides an expansion valve for an air conditioning heat exchange system, which has the advantages of improving the sensitivity of expansion valve regulation and prompting the expansion valve to close quickly after the regulation is completed, thereby solving technical problems such as low expansion valve regulation sensitivity.

[0005] The utility model provides the following technical solution: an expansion valve for an air conditioning heat exchange system, comprising a valve body, and also comprising:

[0006] A valve cover is fixedly sleeved on the lower part of the inner wall of the valve body, the middle part of the valve cover is sleeved with an adjusting knob through a threaded transmission, the middle part of the top surface of the valve cover is fixedly connected with a spring located outside the adjusting knob, the top end of the spring is fixedly connected with a valve core, and the middle part of the top surface of the valve core is fixedly sleeved with a valve plug;

[0007] The liquid inlet pipe is fixedly installed on the right side of the valve body, and the liquid outlet pipe is fixedly installed on the upper side of the left side of the valve body corresponding to the liquid inlet pipe. A pressure box is fixedly installed on the top of the valve body, and a temperature sensing package is fixedly installed on the top of the pressure box through a capillary tube. A diaphragm is fixedly installed inside the pressure box, and a push rod is fixedly sleeved on the middle part of the diaphragm.

[0008] Preferably, the interior of the push rod includes:

[0009] An active cavity is provided inside the push rod;

[0010] A through hole is opened inside the push rod and is located on the upper side of the active cavity. The through hole connects the cavity on the upper side of the diaphragm with the active cavity.

[0011] Preferably, the interior of the activity chamber includes:

[0012] A heat conducting sheet, fixedly connected to the top of the inner cavity of the active cavity;

[0013] The piston plate is slidably connected inside the active cavity and is located at the lower side of the heat conducting plate. Mercury is installed inside the active cavity between the heat conducting plate and the piston plate.

[0014] Preferably, the piston plate comprises:

[0015] A push rod fixedly connected to the bottom surface of the piston plate;

[0016] A through groove is provided inside the push rod, the upper opening of the through groove is communicated with the cavity located on the upper side of the diaphragm in the pressure box, and the lower opening of the through groove is communicated with the opening located on the lower side of the piston plate in the active cavity.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. By designing the active cavity, through hole, heat conducting sheet, piston plate and push rod, when the expansion valve is working, the temperature sensed by the temperature-sensing package will be transmitted to the pressure box. At this time, the temperature is applied to the heat conducting sheet by the design of the through hole, and then the mercury in the active cavity is moved downward by the temperature rise, causing the mercury to push the piston plate downward, and the piston plate drives the push rod downward. The downward push rod directly acts on the valve plug, thereby pushing the valve plug downward, causing the valve plug to drive the valve core downward, causing the liquid inlet pipe to be connected with the liquid outlet pipe, so that the temperature-sensing package can quickly use the expansion valve for adjustment after sensing the temperature, thereby shortening the reaction time of the expansion valve adjustment.

[0019] 2. By designing the through groove, when the expansion valve is adjusted, the spring will push the valve core and the valve plug upward to close the liquid inlet pipe. At this time, the valve plug will first push the push rod, so that the push rod will shrink toward the inside of the active chamber, and the push rod will drive the piston plate to move up, so that the cavity under the piston plate in the active chamber generates negative pressure. By connecting the through groove, the negative pressure can act on the upper side of the diaphragm in the pressure box, so that the diaphragm can shrink quickly. The rapid shrinkage of the diaphragm will drive the push rod to retract quickly, thereby improving the sensitivity of the expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the valve body of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the active cavity of the utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the push rod of the utility model.

[0024] In the figure: 1. valve body; 2. valve cover; 3. adjusting knob; 4. spring; 5. valve core; 6. valve plug; 7. liquid inlet pipe; 8. liquid outlet pipe; 9. pressure box; 10. temperature sensing package; 11. diaphragm; 12. push rod; 121. movable cavity; 122. through hole; 123. heat conductive sheet; 124. piston plate; 125. push rod; 126. through groove. DETAILED DESCRIPTION

[0025] 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 in 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.

[0026] See also Figure 1-Figure 4An expansion valve for an air conditioning heat exchange system comprises a valve body 1, a valve cover 2 is fixedly installed on the lower part of the inner wall of the valve body 1, an adjusting knob 3 is sleeved in the middle of the valve cover 2 through a threaded transmission, a spring 4 is fixedly welded on the middle of the top surface of the valve cover 2 and located outside the adjusting knob 3, the elastic potential energy of the spring 4 is adjusted by rotating the adjusting knob 3, a valve core 5 is fixedly welded on the top of the spring 4, a valve plug 6 is fixedly sleeved in the middle of the top surface of the valve core 5, a liquid inlet pipe 7 is fixedly installed on the right side of the valve body 1, and a valve plug 6 is fixedly installed on the upper side of the left side of the valve body 1 at the corresponding position of the liquid inlet pipe 7 There is a liquid outlet pipe 8, and the up and down movement of the valve plug 6 is used to realize the connection and closing between the liquid inlet pipe 7 and the liquid outlet pipe 8. When the valve plug 6 moves up, the liquid inlet pipe 7 and the liquid outlet pipe 8 are closed, and when the valve plug 6 moves down, the liquid inlet pipe 7 and the liquid outlet pipe 8 are connected. A pressure box 9 is fixedly installed on the top of the valve body 1, and a temperature sensing package 10 is fixedly installed on the top of the pressure box 9 through a capillary tube. A diaphragm 11 is fixedly installed inside the pressure box 9, and a push rod 12 is fixedly sleeved in the middle of the diaphragm 11. The lower part of the push rod 12 extends into the interior of the valve body 1 and contacts with the top of the valve plug 6.

[0027] See also Figure 1-Figure 4 An active cavity 121 is provided inside the push rod 12, and a through hole 122 is provided inside the push rod 12 on the upper side of the active cavity 121. The through hole 122 connects the cavity on the upper side of the diaphragm 11 with the active cavity 121, so that the temperature sensed by the temperature sensing package 10 enters the pressure box 9 and acts on the active cavity 121.

[0028] See also Figure 1-Figure 4 A heat conducting sheet 123 is fixedly welded to the top of the inner cavity of the active cavity 121, and a piston plate 124 is slidably connected to the lower side of the heat conducting sheet 123 inside the active cavity 121. Mercury is installed between the heat conducting sheet 123 and the piston plate 124 inside the active cavity 121. When the temperature acts on the heat conducting sheet 123, the heat conducting sheet 123 is used to heat the mercury, causing the mercury to expand, thereby driving the piston plate 124 to slide down.

[0029] See also Figure 1-Figure 4 A push rod 125 is fixedly welded to the middle part of the bottom surface of the piston plate 124. When the piston plate 124 slides down, the piston plate 124 drives the push rod 125 to move downward, thereby pushing the valve plug 6 downward, so that the liquid inlet pipe 7 is connected with the liquid outlet pipe 8. A through groove 126 is opened inside the push rod 12. The upper opening of the through groove 126 is connected to the cavity located on the upper side of the diaphragm 11 in the pressure box 9, and the lower opening of the through groove 126 is connected to the opening located on the lower side of the piston plate 124 in the active chamber 121. When the cavity located on the lower side of the piston plate 124 in the active chamber 121 generates negative pressure, the negative pressure is transmitted through the through groove 126 to cause the negative pressure to act on the cavity located on the upper side of the diaphragm 11 in the pressure box 9, causing the diaphragm 11 to retract quickly.

[0030] Working principle: When the expansion valve operates normally, the temperature sensed by the temperature-sensing package 10 is transmitted to the pressure box 9. At this time, the temperature inside the pressure box 9 will be transmitted through the through hole 122 to the heat-conducting plate 123, thereby heating the mercury in the active chamber 121. The mercury expands after being heated and pushes the piston plate 124 to slide down with the push rod 125, so that the push rod 125 pushes the valve plug 6 and the valve core 5 to move downward, thereby connecting the liquid inlet pipe 7 with the liquid outlet pipe 8 to achieve regulation. This process saves the time for the diaphragm 11 to expand, greatly shortening the reaction time of the expansion valve. Secondly, after the expansion valve is adjusted, the spring 4 will push the valve core 5 and the valve The plug 6 moves upward. At this time, the valve plug 6 will apply a thrust to the push rod 125, so that the push rod 125 will first retract into the active chamber 121. Since the retraction of the push rod 125 will drive the piston plate 124 to move upward, a negative pressure will be generated in the cavity under the piston plate 124 in the active chamber 121. Due to the connection transmission of the through groove 126, the negative pressure will act on the upper side of the diaphragm 11 in the pressure box 9, thereby prompting the diaphragm 11 to retract quickly. During the retraction process, the diaphragm 11 will drive the push rod 12 to move upward, so that the valve core 5 and the valve plug 6 can quickly close the connection between the liquid inlet pipe 7 and the liquid outlet pipe 8, thereby greatly improving the sensitivity of the expansion valve.

Claims

1. An expansion valve for an air conditioning heat exchange system, comprising a valve body (1), characterized in that: Also includes: A valve cover (2) is fixedly sleeved on the lower part of the inner wall of the valve body (1); an adjusting knob (3) is sleeved on the middle part of the valve cover (2) via a threaded transmission; a spring (4) is fixedly connected to the middle part of the top surface of the valve cover (2) and located outside the adjusting knob (3); a valve core (5) is fixedly connected to the top end of the spring (4); and a valve plug (6) is fixedly sleeved on the middle part of the top surface of the valve core (5); A liquid inlet pipe (7) is fixedly mounted on the right side of the valve body (1); a liquid outlet pipe (8) is fixedly mounted on the upper side of the left side of the valve body (1) corresponding to the liquid inlet pipe (7); a pressure box (9) is fixedly mounted on the top of the valve body (1); a temperature sensing package (10) is fixedly mounted on the top of the pressure box (9) via a capillary tube; a diaphragm (11) is fixedly mounted inside the pressure box (9); and a push rod (12) is fixedly sleeved in the middle of the diaphragm (11).

2. An expansion valve for an air conditioning heat exchange system according to claim 1, characterized in that: The interior of the push rod (12) comprises: An active cavity (121) is provided inside the push rod (12); A through hole (122) is opened inside the push rod (12) and is located on the upper side of the active cavity (121); the through hole (122) connects the cavity on the upper side of the diaphragm (11) with the active cavity (121).

3. The expansion valve for an air conditioning heat exchange system according to claim 2, characterized in that: The interior of the active cavity (121) comprises: A heat conducting sheet (123) fixedly connected to the top of the inner cavity of the active cavity (121); The piston plate (124) is slidably connected to the interior of the active cavity (121) and is located at the lower side of the heat conducting plate (123); mercury is installed in the interior of the active cavity (121) between the heat conducting plate (123) and the piston plate (124).

4. The expansion valve for an air conditioning heat exchange system according to claim 3, characterized in that: The piston plate (124) comprises: A push rod (125) fixedly connected to the bottom surface of the piston plate (124); A through groove (126) is provided inside the push rod (12); an upper opening of the through groove (126) is communicated with a cavity located above the diaphragm (11) in the pressure box (9); and a lower opening of the through groove (126) is communicated with an opening located below the piston plate (124) in the movable cavity (121).

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