阅读说明：本技术 一种过热保护的制冷系统热力膨胀阀感温包 (Refrigeration system thermostatic expansion valve temperature sensing bulb with overheat protection ) 是由 解柏 陈杰 解晓宇 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种过热保护的制冷系统热力膨胀阀感温包,包括热力膨胀阀,其特征在于：所述热力膨胀阀的输出端连接有蒸发器,所述蒸发器的管道均匀排列,所述蒸发器的末端设置有蒸发器出口,所述蒸发器出口的上方安装有感温包,所述感温包与热力膨胀阀之间通过毛细管相连接,所述热力膨胀阀的输入端设置有制冷剂入口,所述热力膨胀阀的输出端设置有制冷剂出口,所述热力膨胀阀的顶部设置有气箱盖,所述气箱盖的内部设置有膜片,所述膜片的下方安装有传动片,所述传动片的下方连接有固定圈,所述固定圈的下方连接有传动杆,所述传动杆的外部安装有压紧弹簧,本发明,具有实用性强和过热保护的特点。(The invention discloses a thermostatic bulb of a thermostatic expansion valve of a refrigeration system with overheat protection, which comprises the thermostatic expansion valve and is characterized in that: the thermal expansion valve comprises a thermal expansion valve body, a thermal expansion valve, a transmission piece, a transmission rod and a compression spring, wherein the output end of the thermal expansion valve body is connected with an evaporator, pipelines of the evaporator are uniformly arranged, the tail end of the evaporator is provided with an evaporator outlet, a temperature sensing bulb is arranged above the evaporator outlet, the temperature sensing bulb is connected with the thermal expansion valve body through a capillary tube, the input end of the thermal expansion valve body is provided with a refrigerant inlet, the output end of the thermal expansion valve body is provided with a refrigerant outlet, the top of the thermal expansion valve body is provided with an air box cover, a diaphragm is arranged inside the air box cover, the transmission piece is arranged below the diaphragm, the fixing ring is connected below the transmission piece, the transmission rod is connected below the fixing ring, and the compression spring is arranged outside the transmission rod.)

1. The utility model provides an overheat protection's refrigerating system thermal expansion valve temperature sensing package, includes thermal expansion valve (1), its characterized in that: the output end of the thermostatic expansion valve (1) is connected with an evaporator (2), the pipelines of the evaporator (2) are uniformly arranged, the tail end of the evaporator (2) is provided with an evaporator outlet (3), a temperature sensing bulb (4) is installed above the evaporator outlet (3), and the temperature sensing bulb (4) is connected with the thermostatic expansion valve (1) through a capillary tube (5).

2. A thermally protected refrigeration system thermostatic expansion valve bulb as set forth in claim 1, wherein: the input of thermal expansion valve (1) is provided with refrigerant entry (10), the output of thermal expansion valve (1) is provided with refrigerant export (11), the top of thermal expansion valve (1) is provided with gas tank lid (12), the inside of gas tank lid (12) is provided with diaphragm (13), driving plate (14) are installed to the below of diaphragm (13), the below of driving plate (14) is connected with retainer plate (15), the below of retainer plate (15) is connected with transfer line (17), the externally mounted of transfer line (17) has pressure spring (16), case (19) are installed to the end of transfer line (17).

3. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 2, wherein: the thermostatic expansion valve is characterized in that a valve core frame (20) is arranged below the valve core (19), an adjusting spring (21) is connected below the valve core frame (20), an adjusting screw (22) is connected to the lower portion of the adjusting spring (21), threads are arranged on the lower side of the inner wall of the thermostatic expansion valve (1), and the adjusting screw (22) is in threaded connection with the inner wall of the thermostatic expansion valve (1).

4. A thermal expansion valve bulb for a thermal expansion system of a thermal over-temperature protected refrigeration system as set forth in claim 3, wherein: the inside of thermal bulb (4) is provided with inner shell (24), the outside of thermal bulb (4) is provided with shell (23), the both sides of inner shell (24) are provided with support frame (26).

5. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 4, wherein: the heat-conducting type evaporator is characterized in that a movable plate (27) is arranged inside the inner shell (24), a heat-conducting rod (25) penetrates through the inner shell (24) and the evaporator outlet (3) below the movable plate (27), a piston rod (31) is connected below the movable plate (27), a piston (30) is connected to the tail end of the piston rod (31), a piston cavity (28) is arranged outside the piston (30), the bottom of the piston cavity (28) is connected with the evaporator outlet (3), and an air bag (29) is arranged below the inside of the piston cavity (28).

6. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 5, wherein: the top of the inner shell (24) penetrates through the outer shell (23) to be connected with an air pipe (7), the tail end of the air pipe (7) is connected with an air pressure valve (9), a guide pipe (8) is connected between the refrigerant inlet (10) and the outer shell (23), the air pressure valve (9) is located in the middle of the guide pipe (8), and elastic balls (32) are installed on two sides of the inner shell (24).

7. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 6, wherein: the top of pneumatic valve (9) is provided with pneumatic telescopic link (33), the end bearing of pneumatic telescopic link (33) is connected with movable rod (34), the middle part bearing of movable rod (34) is connected with bracing piece (35), the end bearing of movable rod (34) is connected with push rod (36), the end-to-end connection of push rod (36) has valve rod (41), the end-to-end connection of valve rod (41) has pneumatic valve core (42), pneumatic valve (9) are provided with disk seat (44) with the junction of pipe (8), the middle part of disk seat (44) is provided with opening (43).

8. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 7, wherein: a baffle (38) is arranged in the middle of the push rod (36), a spring (37) is arranged on the outer side of the baffle (38), and a stop block (39) is arranged at the joint of the push rod (36) and the valve rod (41).

9. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 8, wherein: the interface of the thermostatic expansion valve (1) is a flange interface, an O-shaped ring (18) is installed outside the transmission rod (17), a sealing opening (40) is arranged outside the valve rod (41), and a sealing filler (45) is filled inside the sealing opening (40).

10. An overheat protected refrigeration system thermostatic expansion valve bulb as set forth in claim 9, wherein: and a balance pipe (6) is connected between the evaporator outlet (3) and the upper part of the thermostatic expansion valve (1).

Technical Field

The invention relates to the technical field of refrigeration, in particular to a thermostatic expansion valve temperature sensing bulb of a refrigeration system with overheat protection.

Background

The thermostatic expansion valve is developed by controlling the expansion valve through the superheat degree of gaseous refrigerant at the outlet of an evaporator, is an important part forming a refrigerating device, and is one of four basic devices in a refrigerating system. The thermostatic expansion valve can be divided into an internal balance type and an external balance type. The thermostatic expansion valve temperature sensing system adopts different materials and modes for filling, the main modes comprise a liquid filling mode, an inflatable mode, a cross liquid filling mode, a mixed filling mode and an adsorption filling mode, the thermostatic expansion valve realizes the throttling from the condensation pressure to the evaporation pressure, and simultaneously controls the flow of a refrigerant; although its volume is small, its action is huge, its working quality can be directly determined, and the optimum mode can be used for supplying liquid to evaporator so as to ensure that the superheat degree of refrigerant vapour at outlet of evaporator is stable.

However, the conventional thermostatic expansion valve has no overheat protection function, and the temperature sensing bulb may be damaged when the temperature at the outlet of the evaporator is too high, so that the practicability is poor. Therefore, it is necessary to design a thermal expansion valve bulb of a refrigeration system with strong practicability and overheat protection.

Disclosure of Invention

The present invention is directed to a thermostatic bulb of a thermostatic expansion valve of a refrigeration system with overheat protection, so as to solve the problems mentioned in the background art.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a refrigerating system thermal expansion valve temperature sensing package of overheat protection, includes thermal expansion valve, its characterized in that: the output end of the thermostatic expansion valve is connected with an evaporator, pipelines of the evaporator are uniformly arranged, the tail end of the evaporator is provided with an evaporator outlet, a temperature sensing bulb is arranged above the evaporator outlet, and the temperature sensing bulb is connected with the thermostatic expansion valve through a capillary tube.

According to the technical scheme, the input end of the thermostatic expansion valve is provided with a refrigerant inlet, the output end of the thermostatic expansion valve is provided with a refrigerant outlet, the top of the thermostatic expansion valve is provided with an air tank cover, a diaphragm is arranged inside the air tank cover, a transmission piece is arranged below the diaphragm, a fixing ring is connected below the transmission piece, a transmission rod is connected below the fixing ring, a compression spring is arranged outside the transmission rod, and the tail end of the transmission rod is provided with a valve core.

According to the technical scheme, the valve core frame is arranged below the valve core, the adjusting spring is connected below the valve core frame, the lower portion of the adjusting spring is connected with the adjusting screw, the lower side of the inner wall of the thermostatic expansion valve is provided with the thread, and the adjusting screw is in threaded connection with the inner wall of the thermostatic expansion valve.

According to the technical scheme, the inner shell is arranged inside the thermal bulb, the outer shell is arranged outside the thermal bulb, and the support frames are arranged on two sides of the inner shell.

According to the technical scheme, the movable plate is arranged inside the inner shell, the lower portion of the movable plate penetrates through the inner shell and is connected with the heat conducting rod between the inner shell and the evaporator outlet, the piston rod is connected with the lower portion of the movable plate, the tail end of the piston rod is connected with the piston, the piston cavity is arranged outside the piston, the bottom of the piston cavity is connected with the evaporator outlet, and the air bag is arranged below the inner portion of the piston cavity.

According to the technical scheme, the top of the inner shell penetrates through the outer shell to be connected with the air pipe, the tail end of the air pipe is connected with the air pressure valve, the guide pipe is connected between the refrigerant inlet and the outer shell, the air pressure valve is located in the middle of the guide pipe, and the elastic balls are installed on two sides of the inner shell.

According to the technical scheme, the top of the air pressure valve is provided with the pneumatic telescopic rod, the end bearing of the pneumatic telescopic rod is connected with the movable rod, the middle bearing of the movable rod is connected with the supporting rod, the end bearing of the movable rod is connected with the push rod, the end of the push rod is connected with the valve rod, the end of the valve rod is connected with the air pressure valve core, the joint of the air pressure valve and the guide pipe is provided with the valve seat, and the middle of the valve seat is provided with the opening.

According to the technical scheme, the middle of the push rod is provided with the baffle, the outer side of the baffle is provided with the spring, and the joint of the push rod and the valve rod is provided with the stop block.

According to the technical scheme, the interfaces of the thermostatic expansion valve are flange interfaces, the outside of the transmission rod is provided with an O-shaped ring, the outside of the valve rod is provided with a sealing opening, and sealing filler is filled in the sealing opening.

According to the technical scheme, a balance pipe is connected between the outlet of the evaporator and the upper part of the thermostatic expansion valve.

Compared with the prior art, the invention has the following beneficial effects: according to the invention, the air pipe and the air pressure valve are arranged, when the temperature is continuously increased, the expansion amplitude of the air bag is increased, the movement amplitude of the movable plate is increased, the air above the movable plate is extruded to enter the air pressure valve along the air pipe, so that the air pressure valve is opened, the guide pipe is conducted, part of refrigerant flows into the shell along the guide pipe, and the temperature of the temperature sensing bulb is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the thermostatic expansion valve of the present invention;

FIG. 3 is a schematic view of the structure of the thermal bulb of the present invention;

FIG. 4 is a schematic view of the thermal bulb mounting structure of the present invention;

FIG. 5 is a schematic view of the pneumatic valve of the present invention;

in the figure: 1. a thermostatic expansion valve; 2. an evaporator; 3. an evaporator outlet; 4. a temperature sensing bulb; 5. a capillary tube; 6. a balance tube; 7. an air tube; 8. a conduit; 9. a pneumatic valve; 10. a refrigerant inlet; 11. a refrigerant outlet; 12. a gas tank cover; 13. a membrane; 14. a driving strap; 15. a stationary ring; 16. a compression spring; 17. a transmission rod; 18. an O-shaped ring; 19. a valve core; 20. a valve core frame; 21. adjusting the spring; 22. adjusting screws; 23. a housing; 24. an inner shell; 25. a heat conducting rod; 26. a support frame; 27. a movable plate; 28. a piston cavity; 29. an air bag; 30. a piston; 31. a piston rod; 32. an elastic ball; 33. a pneumatic telescopic rod; 34. a movable rod; 35. a support bar; 36. a push rod; 37. a spring; 38. a baffle plate; 39. a stopper; 40. sealing the opening; 41. a valve stem; 42. a pneumatic valve core; 43. a port; 44. a valve seat; 45. and (5) sealing and filling.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides the following technical solutions: the utility model provides a refrigerating system thermal expansion valve temperature sensing package of overheat protection, includes thermal expansion valve 1, its characterized in that: the output end of the thermostatic expansion valve 1 is connected with an evaporator 2, pipelines of the evaporator 2 are uniformly arranged, the tail end of the evaporator 2 is provided with an evaporator outlet 3, a temperature sensing bulb 4 is arranged above the evaporator outlet 3, the temperature sensing bulb 4 is connected with the thermostatic expansion valve 1 through a capillary tube 5, liquid refrigerant enters the evaporator 2 through the thermostatic expansion valve 1 during refrigeration, is converted into low-temperature and low-pressure gaseous refrigerant through evaporation of the evaporator 2 and is discharged through the evaporator outlet 3, the temperature sensing bulb 4 is arranged above the evaporator outlet 3, the temperature at the evaporator outlet 3 is conducted to the thermostatic expansion valve 1 through the capillary tube 5, the flow of the refrigerant is further controlled, through the steps, the gaseous refrigerant is completely discharged from the evaporator outlet 3, the situation that the evaporator outlet 3 contains the liquid refrigerant when the flow of the refrigerant is too large is avoided, the liquid refrigerant enters a compressor to generate liquid impact, or the refrigerant is evaporated in advance when the flow is too small, so that the refrigeration is insufficient;

the input end of the thermostatic expansion valve 1 is provided with a refrigerant inlet 10, the output end of the thermostatic expansion valve 1 is provided with a refrigerant outlet 11, the top of the thermostatic expansion valve 1 is provided with an air tank cover 12, the inside of the air tank cover 12 is provided with a diaphragm 13, the lower part of the diaphragm 13 is provided with a transmission sheet 14, the lower part of the transmission sheet 14 is connected with a fixed ring 15, the lower part of the fixed ring 15 is connected with a transmission rod 17, the outside of the transmission rod 17 is provided with a compression spring 16, the tail end of the transmission rod 17 is provided with a valve core 19, the refrigerant enters the thermostatic expansion valve 1 from the refrigerant inlet 10 and flows out from the refrigerant outlet 11, the temperature sensing bag 4 transmits the temperature at the evaporator outlet 3 to the inside of the thermostatic expansion valve 1 through a capillary tube 5, the diaphragm 13 inside the air tank cover 12 can sense the temperature at the evaporator outlet 3, when the temperature is higher, the diaphragm 13 pushes the transmission sheet 14 to move downwards to drive the fixed ring 15 to move downwards, the transmission rod 17 connected below the fixed ring 15 also moves downwards, the compression spring 16 compresses to drive the valve core 19 connected with the tail end of the transmission rod 17 to move downwards, so that the flow of the refrigerant is reduced, when the temperature is lower, the fixed ring 15 moves upwards under the action of the elastic force of the compression spring 16 again to drive the transmission rod 17 and the valve core 19 to move upwards, so that the flow of the refrigerant is reduced, and through the steps, the flow of the refrigerant is self-regulated according to the temperature;

a valve core frame 20 is arranged below the valve core 19, an adjusting spring 21 is connected below the valve core frame 20, an adjusting screw 22 is connected below the adjusting spring 21, threads are arranged on the lower side of the inner wall of the thermostatic expansion valve 1, the adjusting screw 22 is in threaded connection with the inner wall of the thermostatic expansion valve 1, when the valve core 19 moves downwards, the valve core frame 20 below is pushed to move downwards, the adjusting spring 21 is compressed to generate elastic force in the opposite direction, the phenomenon that the movement amplitude of the valve core 19 is overlarge is avoided, when the temperature change range is large, the adjusting screw 22 is rotated to enable the adjusting screw 22 to move downwards, and the valve core frame 20 also moves downwards, through the steps, the movement range of the valve core 19 is enlarged, and the control range of the thermostatic expansion valve 1 is enlarged;

the inner shell 24 is arranged in the temperature sensing bulb 4, the outer shell 23 is arranged outside the temperature sensing bulb 4, the support frames 26 are arranged on two sides of the inner shell 24, the temperature sensing bulb 4 is divided into the inner shell 24 and the outer shell 23, the inner shell 23 is supported by the support frames 26 to avoid direct contact with the evaporator outlet 3, the temperature sensing bulb 4 is prevented from being damaged when the temperature of the evaporator outlet 3 is too high, the outer shell 23 can protect the temperature sensing bulb 4 and avoid damage when the temperature sensing bulb is impacted, and the service life of the temperature sensing bulb 4 is effectively prolonged;

a movable plate 27 is arranged in the inner shell 24, a heat conducting rod 25 is connected below the movable plate 27 and penetrates through the inner shell 24 and is connected with the evaporator outlet 3, a piston rod 31 is connected below the movable plate 27, the tail end of the piston rod 31 is connected with a piston 30, a piston cavity 28 is arranged outside the piston 30, the bottom of the piston cavity 28 is connected with the evaporator outlet 3, an air bag 29 is arranged below the inner part of the piston cavity 28, the temperature sensing bulb 4 transfers heat through the heat conducting rod 25 and transfers the temperature to the thermostatic expansion valve 1 through a capillary tube 5, when the temperature of the evaporator outlet 3 is too high, the air bag 29 is heated and expanded to push the piston 30 to move upwards in the piston cavity 28, so that the piston rod 31 also moves upwards to drive the movable plate 27 to move upwards in the inner shell 24, the heat conducting rod 25 connected with the movable plate 27 also moves upwards to be separated from the evaporator outlet 3, so as to reduce heat transfer, and through the steps, the damage of the temperature sensing bulb 4 when the temperature is too high is avoided;

the top of the inner shell 24 penetrates through the outer shell 23 to be connected with the air pipe 7, the tail end of the air pipe 7 is connected with the air pressure valve 9, the guide pipe 8 is connected between the refrigerant inlet 10 and the outer shell 23, the air pressure valve 9 is located in the middle of the guide pipe 8, the elastic balls 32 are installed on two sides of the inner shell 24, when the temperature continuously rises, the expansion amplitude of the air bag 29 is increased, the movement amplitude of the movable plate 27 is increased, the gas above the movable plate 27 is extruded to enter the air pressure valve 9 along the air pipe 7, the air pressure valve 9 is opened, the guide pipe 8 is conducted, part of the refrigerant flows into the outer shell 23 along the guide pipe 8, and the temperature of the thermal bulb 4 is reduced;

the top of the pneumatic valve 9 is provided with a pneumatic telescopic rod 33, the end bearing of the pneumatic telescopic rod 33 is connected with a movable rod 34, the middle bearing of the movable rod 34 is connected with a support rod 35, the end bearing of the movable rod 34 is connected with a push rod 36, the end of the push rod 36 is connected with a valve rod 41, the end of the valve rod 41 is connected with a pneumatic valve core 42, the joint of the pneumatic valve 9 and the guide pipe 8 is provided with a valve seat 44, the middle part of the valve seat 44 is provided with a through hole 43, the air in the inner shell 24 flows into the pneumatic telescopic rod 33 along the air pipe 7, the pneumatic telescopic rod 33 is extended to drive the movable rod 34 to rotate around the support rod 35, the push rod 36 moves towards the outside of the pneumatic valve 9 to drive the valve rod 41 to move together, the air pressure valve core 42 at the tail end of the valve rod 41 moves along with the valve rod, the through hole 43 is opened, so that the refrigerant is circulated through the through hole 43, and the opening and closing control of the air pressure valve 9 is realized through the steps;

a baffle 38 is arranged in the middle of the push rod 36, a spring 37 is arranged on the outer side of the baffle 38, a stop block 39 is arranged at the joint of the push rod 36 and the valve rod 41, when the pneumatic valve 9 is communicated, the spring 38 is compressed to generate elastic force in the opposite direction, when the temperature is low, the air pressure is low, at the moment, the push rod 36 moves towards the inside of the valve body under the elastic force of the spring to drive the baffle 36 to move together, the valve rod 41 also moves along with the elastic force, and the air pressure valve core 42 blocks the through hole 43 to close the guide pipe 8, so that the automatic reset of the pneumatic valve 9 is realized through the steps;

the interfaces of the thermostatic expansion valve 1 are flange interfaces, an O-shaped ring 18 is arranged outside the transmission rod 17, a sealing opening 40 is arranged outside the valve rod 41, and a sealing filler 45 is filled inside the sealing opening 40. The flange interface has high reliability, is not easy to damage and has good sealing performance, the refrigerant is prevented from leaking, the O-shaped ring can improve the sealing performance of the thermostatic expansion valve 1, the sensitivity of the thermostatic expansion valve is further improved, and the sealing filler 45 is filled in the sealing port 40, so that the sealing performance of the air pressure valve 9 can be effectively improved, and the refrigerant is prevented from leaking;

a balance pipe 6 is connected between the evaporator outlet 3 and the upper part of the thermostatic expansion valve 1, the balance pipe 6 can transmit the real-time pressure at the evaporator outlet 3 to the thermostatic expansion valve 1, so that the flow of the refrigerant is controlled, the loss of heat in the transmission of the capillary tube 5 can be compensated, and the sensitivity of the thermostatic expansion valve 1 is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.