CN110033689B

CN110033689B - Expansion valve rack for teaching display

Info

Publication number: CN110033689B
Application number: CN201910248666.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Haian Ruihua Textile Technology Co ltd
Current assignee: HAIAN RUIHUA TEXTILE TECHNOLOGY Co.,Ltd.
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2021-02-19
Anticipated expiration: 2039-03-29
Also published as: CN110033689A

Abstract

The invention relates to a teaching display rack, in particular to an expansion valve rack for teaching display. The technical problem is as follows: the expansion valve rack for teaching demonstration is visual, well understood, capable of preserving heat and free of influence of external temperature. The technical scheme is as follows: an expansion valve rack for teaching display comprises a rack, a condenser, a first connecting pipe, a second connecting pipe, a compressor, an evaporator, a third connecting pipe, a fourth connecting pipe, an expansion valve body, a first bolt and the like; a condenser is installed on the left side of the top of the rack, a first connecting pipe is connected to the lower portion of the right side of the condenser, and a compressor is installed on the upper portion of the right side of the condenser. According to the invention, an external heat source is connected with the evaporator, so that the device runs, the temperature sensing bulb can better receive the temperature of the fourth connecting pipe through the heat preservation device, and the inaccurate demonstration result caused by the influence of the external temperature can be prevented.

Description

Expansion valve rack for teaching display

Technical Field

The invention relates to a teaching display rack, in particular to an expansion valve rack for teaching display.

Background

An expansion valve is an important component in a refrigeration system and is typically mounted between the reservoir and the evaporator. The expansion valve enables the medium-temperature high-pressure liquid refrigerant to be low-temperature low-pressure wet steam through throttling, then the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect, and the expansion valve controls the flow of the valve through the change of the superheat degree of the tail end of the evaporator to prevent the phenomena of insufficient utilization of the area of the evaporator and cylinder knocking. In the teaching process, when the mr explains expansion valve theory of operation, generally explain through the word description or add some pictures, so the student is not enough directly perceived when studying, relatively difficult understanding, for this reason, the mr can demonstrate through teaching show rack, but the expansion valve demonstration rack that uses at present can not keep apart the temperature, can receive indoor temperature influence, leads to the demonstration result inaccurate.

Disclosure of Invention

In order to overcome the student not directly perceived inadequately when studying, relatively difficult understanding, the expansion valve demonstration rack that uses at present can not keep apart the temperature, can receive indoor temperature influence, leads to demonstrating inaccurate shortcoming, technical problem of result: the expansion valve rack for teaching demonstration is visual, well understood, capable of preserving heat and free of influence of external temperature.

The technical scheme is as follows: an expansion valve rack for teaching display comprises a rack, a condenser, a first connecting pipe, a second connecting pipe, a compressor, an evaporator, a third connecting pipe, a fourth connecting pipe, an expansion valve body, a first bolt, a fixing plate, a first clamping block, a first connecting rod, a first guide sleeve, a first guide rod, a second clamping block, a first compression spring, a contact plate, a diaphragm, a transparent plate, a temperature sensing bulb, a bent pipe, inert liquid, a heat preservation device, a second bolt and a nut, wherein the condenser is installed on the left side of the top of the rack, the first connecting pipe is connected with the lower portion of the right side of the condenser, the compressor is installed on the upper portion of the right side of the condenser, the second connecting pipe is connected with the right side of the compressor, the expansion valve body is embedded in the middle of the rack, the right ends of the first connecting pipe and the second connecting pipe are both connected and communicated with the lower portion, the left side of the evaporator is respectively connected with a third connecting pipe and a fourth connecting pipe, the third connecting pipe is positioned below the fourth connecting pipe, the left ends of the third connecting pipe and the fourth connecting pipe are both connected and communicated with the lower part of the right side of the expansion valve body, the middle of the bottom of the expansion valve body is provided with a first threaded hole, the first threaded hole is connected with a first bolt in a threaded connection mode, the top of the first bolt is connected with a fixed plate, the left side and the right side of the lower part in the expansion valve body are both connected with first clamping blocks, the left first clamping block is positioned between the first connecting pipe and the second connecting pipe, the right first clamping block is positioned between the third connecting pipe and the fourth connecting pipe, a first connecting rod is connected between the left side and the right side of the middle part of the inner side of the expansion valve body, the middle part of the first connecting rod is connected with a first, the second fixture block is located between the left first fixture block and the right first fixture block, the first fixture block is matched with the second fixture block, the bottom of the second fixture block is connected with a first compression spring, the bottom end of the first compression spring is connected with a contact plate, the contact plate is in contact with the top of a fixed plate, the upper portion in the expansion valve body is connected with a diaphragm, the top end of a first guide rod is connected with the bottom of the diaphragm in the middle, a transparent plate is embedded at the upper portion of the front side of the expansion valve body, a heat preservation device is arranged in the middle of a fourth connecting pipe, a temperature sensing bag is arranged in the heat preservation device and located above the fourth connecting pipe, a curved pipe is connected to the right side of the temperature sensing bag, the top end of the curved pipe is connected with the top of the expansion valve body in the middle, inert liquid is filled in the curved pipe and the expansion valve body on.

Preferably, the heat preservation device is including the rubber fixture block, the cushion, the soft stick that keeps warm and press from both sides the cover, the middle part outside of fourth connecting pipe is equipped with the cover that presss from both sides, the second screw hole is opened respectively in the left and right sides portion around pressing from both sides cover upper portion, two second screw holes around the second bolt passes, the cooperation of second bolt and nut will press from both sides the cover fixed, the inboard that presss from both sides the cover is equipped with the cushion, be equipped with the rubber fixture block between fourth connecting pipe and the temperature sensing package, fourth connecting pipe and temperature sensing package all are located the cushion, the cushion is equipped with a plurality of soft sticks that keep warm with the clearance department of fourth connecting.

As preferably, still including the seal cover, L type push rod, first push rod, the pointer, scale bar and thermometer, the seal cover has been inlayed on the right side upper portion of inflation valve body, the slidingtype L type push rod that is equipped with in the seal cover, the left end of L type push rod is connected with the upper portion of first guide arm, the lower part front side of L type push rod is connected with first push rod, the right-hand member of first push rod is connected with the pointer, the right side upper portion of inflation valve body is connected with the scale bar, the scale bar is located the right-hand of seal cover, the pointer is located the front side of scale bar, the top of.

Preferably, the clamping device further comprises a second compression spring, a pressure rod and a pressure bell, the middle of the left side of the right first clamping block is provided with a groove, the side of the groove is connected with the pressure bell and the second compression spring, the pressure rod is arranged in the groove and located on the left side of the pressure bell, the second compression spring is wound on the pressure rod, the left end of the second compression spring is connected with the left portion of the pressure rod, and the left end of the pressure rod is in contact with the right side of the second clamping block.

The invention has the beneficial effects that: according to the device, an external heat source is connected with the evaporator, so that the device runs, the temperature sensing bulb can better receive the temperature of the fourth connecting pipe through the heat preservation device, the inaccurate demonstration result caused by the influence of the external temperature can be prevented, the demonstration effect of the device can be more visually observed through the matching of the pointer and the scale bar and according to the temperature displayed by the thermometer, the pressing bell is extruded by the pressing rod to make a sound, and people can be reminded that the second clamping block is reset.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a partial right view structural diagram of the present invention.

Fig. 3 is an enlarged schematic view of the structure of the present invention a.

Description of reference numerals: 1 rack, 2 condenser, 3 first connecting pipe, 4 second connecting pipe, 5 compressor, 6 evaporator, 7 third connecting pipe, 8 fourth connecting pipe, 9 expansion valve body, 10 first screw hole, 11 first bolt, 12 fixed plate, 13 first fixture block, 14 first connecting rod, 15 first guide sleeve, 16 first guide rod, 17 second fixture block, 18 first compression spring, 19 contact plate, 20 diaphragm, 201 transparent plate, 21 temperature sensing bulb, 211 bent pipe, 212 inert liquid, 22 heat preservation device, 221 rubber fixture block, 222 soft cushion, 223 heat preservation soft rod, 224 jacket, 23 second screw hole, 24 second bolt, 25 nut, 26 sealing sleeve, 27L-shaped push rod, 28 first push rod, 29 pointer, 30 scale bar, 31 thermometer, 32 groove, 33 second compression spring, 34 pressure rod, 35 press bell.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.

Example 1

An expansion valve rack for teaching display, as shown in fig. 1-2, comprises a rack 1, a condenser 2, a first connecting pipe 3, a second connecting pipe 4, a compressor 5, an evaporator 6, a third connecting pipe 7, a fourth connecting pipe 8, an expansion valve body 9, a first bolt 11, a fixing plate 12, a first clamping block 13, a first connecting rod 14, a first guide sleeve 15, a first guide rod 16, a second clamping block 17, a first compression spring 18, a contact plate 19, a diaphragm 20, a transparent plate 201, a temperature sensing bag 21, a curved pipe 211, an inert liquid 212, a heat preservation device 22, a second bolt 24 and a nut 25, wherein the condenser 2 is installed on the left side of the top of the rack 1, the rack 1 is connected with the condenser 2 in a bolt connection mode, the first connecting pipe 3 is connected with the lower part of the right side of the condenser 2, the compressor 5 is installed on the upper part of the right side of the condenser 2, the second connecting pipe 4 is, an expansion valve body 9 is embedded in the middle of a rack 1, the right ends of a first connecting pipe 3 and a second connecting pipe 4 are connected and communicated with the lower part of the left side of the expansion valve body 9, an evaporator 6 is installed on the right side of the top of the rack 1, the rack 1 is connected with the evaporator 6 through a bolt connection mode, the left side of the evaporator 6 is respectively connected with a third connecting pipe 7 and a fourth connecting pipe 8, the third connecting pipe 7 is positioned below the fourth connecting pipe 8, the left ends of the third connecting pipe 7 and the fourth connecting pipe 8 are connected and communicated with the lower part of the right side of the expansion valve body 9, a first threaded hole 10 is formed in the middle of the bottom of the expansion valve body 9, a first bolt 11 is connected in the first threaded hole 10 in a threaded connection mode, the top of the first bolt 11 is connected with a fixing plate 12, the first bolt 11 is connected with the fixing plate 12 through a welding connection mode, and first clamping blocks 13 are, the left first fixture block 13 is positioned between the first connecting pipe 3 and the second connecting pipe 4, the right first fixture block 13 is positioned between the third connecting pipe 7 and the fourth connecting pipe 8, the left and right sides of the middle part of the inner side of the expansion valve body 9 are connected with the first connecting rods 14, the middle part of the first connecting rods 14 is connected with the first guide sleeve 15, the first guide sleeve 15 is connected with the first guide rod 16 in a sliding way, the bottom of the first guide rod 16 is connected with the second fixture block 17, the first guide rod 16 is connected with the second fixture block 17 through a welding connection mode, the second fixture block 17 is positioned between the left first fixture block 13 and the right first fixture block 13, the first fixture block 13 is matched with the second fixture block 17, the bottom of the second fixture block 17 is connected with the first compression spring 18, the bottom end of the first compression spring 18 is connected with the contact plate 19, the contact plate 19 is contacted with the top of the fixing plate 12, the upper part in the expansion, transparent plate 201 has been inlayed on expansion valve body 9's front side upper portion, the middle part of fourth connecting pipe 8 is equipped with heat preservation device 22, be equipped with temperature sensing package 21 in the heat preservation device 22, temperature sensing package 21 is located the top of fourth connecting pipe 8, temperature sensing package 21's right side is connected with bent pipe 211, the top of bent pipe 211 and expansion valve body 9's top intermediate junction and intercommunication, all be equipped with inert liquid 212 in bent pipe 211 and the expansion valve body 9 on diaphragm 20 upper portion, it has second screw hole 23 to open on heat preservation device 22's the part, be equipped with second bolt 24 in the second screw hole 23, the front portion of second bolt 24 is equipped with nut 25.

Example 2

An expansion valve rack for teaching display, as shown in fig. 1-2, comprises a rack 1, a condenser 2, a first connecting pipe 3, a second connecting pipe 4, a compressor 5, an evaporator 6, a third connecting pipe 7, a fourth connecting pipe 8, an expansion valve body 9, a first bolt 11, a fixing plate 12, a first clamping block 13, a first connecting rod 14, a first guide sleeve 15, a first guide rod 16, a second clamping block 17, a first compression spring 18, a contact plate 19, a diaphragm 20, a transparent plate 201, a temperature sensing bag 21, a curved pipe 211, an inert liquid 212, a heat preservation device 22, a second bolt 24 and a nut 25, wherein the condenser 2 is installed on the left side of the top of the rack 1, the first connecting pipe 3 is connected to the lower part of the right side of the condenser 2, the compressor 5 is installed on the upper part of the right side of the condenser 2, the second connecting pipe 4 is connected to the right side of the compressor 5, the expansion, the right ends of the first connecting pipe 3 and the second connecting pipe 4 are connected and communicated with the lower part of the left side of the expansion valve body 9, the right side of the top of the rack 1 is provided with an evaporator 6, the left side of the evaporator 6 is respectively connected with a third connecting pipe 7 and a fourth connecting pipe 8, the third connecting pipe 7 is positioned below the fourth connecting pipe 8, the left ends of the third connecting pipe 7 and the fourth connecting pipe 8 are connected and communicated with the lower part of the right side of the expansion valve body 9, the middle of the bottom of the expansion valve body 9 is provided with a first threaded hole 10, the first threaded hole 10 is internally connected with a first bolt 11 in a threaded connection mode, the top of the first bolt 11 is connected with a fixing plate 12, the left side and the right side of the lower part in the expansion valve body 9 are both connected with first clamping blocks 13, the first clamping block 13 on the left side is positioned between the first connecting pipe 3 and the second connecting pipe 4, a first connecting rod 14 is connected between the left side and the right side of the middle part of the inner side of the expansion valve body 9, a first guide sleeve 15 is connected at the middle part of the first connecting rod 14, a first guide rod 16 is connected in the first guide sleeve 15 in a sliding manner, a second clamping block 17 is connected at the bottom of the first guide rod 16, the second clamping block 17 is positioned between the left first clamping block 13 and the right first clamping block 13, the first clamping block 13 is matched with the second clamping block 17, a first compression spring 18 is connected at the bottom of the second clamping block 17, a contact plate 19 is connected at the bottom end of the first compression spring 18, the contact plate 19 is contacted with the top of the fixed plate 12, a diaphragm 20 is connected at the upper part in the expansion valve body 9, the top end of the first guide rod 16 is connected with the middle of the bottom of the diaphragm 20, a transparent plate 201 is embedded at the upper part of the front side of the expansion valve body 9, the right side of the thermal bulb 21 is connected with a curved tube 211, the top end of the curved tube 211 is connected and communicated with the middle of the top of the expansion valve body 9, inert liquid 212 is filled in the curved tube 211 and the expansion valve body 9 on the upper portion of the diaphragm 20, a second threaded hole 23 is formed in a part of the heat preservation device 22, a second bolt 24 is arranged in the second threaded hole 23, and a nut 25 is arranged at the front portion of the second bolt 24.

The heat preservation device 22 comprises a rubber clamping block 221, a soft cushion 222, heat preservation soft rods 223 and a clamping sleeve 224, a clamping sleeve 224 is arranged on the outer side of the middle of the fourth connecting pipe 8, second threaded holes 23 are respectively formed in the left and right portions of the front side and the rear side of the upper portion of the clamping sleeve 224, a second bolt 24 penetrates through the front and rear two second threaded holes 23, the clamping sleeve 224 is fixed through the cooperation of the second bolt 24 and a nut 25, the soft cushion 222 is arranged on the inner side of the clamping sleeve 224, the rubber clamping block 221 is arranged between the fourth connecting pipe 8 and the temperature sensing bulb 21, the fourth connecting pipe 8 and the temperature sensing bulb 21 are both located in the soft cushion 222, and a plurality of heat preservation soft rods 223 are arranged in the gap between.

Example 3

The expansion valve comprises an expansion valve body 9 and is characterized by further comprising a sealing sleeve 26, an L-shaped push rod 27, a first push rod 28, a pointer 29, a scale bar 30 and a thermometer 31, wherein the sealing sleeve 26 is embedded in the upper portion of the right side of the expansion valve body 9, the L-shaped push rod 27 is arranged in the sealing sleeve 26 in a sliding mode, the left end of the L-shaped push rod 27 is connected with the upper portion of a first guide rod 16, the L-shaped push rod 27 is connected with the first guide rod 16 in a welding connection mode, the front side of the lower portion of the L-shaped push rod 27 is connected with the first push rod 28, the L-shaped push rod 27 is connected with the first push rod 28 in a welding connection mode, the right end of the first push rod 28 is connected with the pointer 29, the upper portion of the right side of the expansion valve body 9 is connected with the scale bar 30, the expansion valve body 9 is connected with the.

Example 4

An expansion valve rack for teaching display, as shown in fig. 1-3, comprises a rack 1, a condenser 2, a first connecting pipe 3, a second connecting pipe 4, a compressor 5, an evaporator 6, a third connecting pipe 7, a fourth connecting pipe 8, an expansion valve body 9, a first bolt 11, a fixing plate 12, a first clamping block 13, a first connecting rod 14, a first guide sleeve 15, a first guide rod 16, a second clamping block 17, a first compression spring 18, a contact plate 19, a diaphragm 20, a transparent plate 201, a temperature sensing bag 21, a curved pipe 211, an inert liquid 212, a heat preservation device 22, a second bolt 24 and a nut 25, wherein the condenser 2 is installed on the left side of the top of the rack 1, the first connecting pipe 3 is connected to the lower part of the right side of the condenser 2, the compressor 5 is installed on the upper part of the right side of the condenser 2, the second connecting pipe 4 is connected to the right side of the compressor 5, the expansion, the right ends of the first connecting pipe 3 and the second connecting pipe 4 are connected and communicated with the lower part of the left side of the expansion valve body 9, the right side of the top of the rack 1 is provided with an evaporator 6, the left side of the evaporator 6 is respectively connected with a third connecting pipe 7 and a fourth connecting pipe 8, the third connecting pipe 7 is positioned below the fourth connecting pipe 8, the left ends of the third connecting pipe 7 and the fourth connecting pipe 8 are connected and communicated with the lower part of the right side of the expansion valve body 9, the middle of the bottom of the expansion valve body 9 is provided with a first threaded hole 10, the first threaded hole 10 is internally connected with a first bolt 11 in a threaded connection mode, the top of the first bolt 11 is connected with a fixing plate 12, the left side and the right side of the lower part in the expansion valve body 9 are both connected with first clamping blocks 13, the first clamping block 13 on the left side is positioned between the first connecting pipe 3 and the second connecting pipe 4, a first connecting rod 14 is connected between the left side and the right side of the middle part of the inner side of the expansion valve body 9, a first guide sleeve 15 is connected at the middle part of the first connecting rod 14, a first guide rod 16 is connected in the first guide sleeve 15 in a sliding manner, a second clamping block 17 is connected at the bottom of the first guide rod 16, the second clamping block 17 is positioned between the left first clamping block 13 and the right first clamping block 13, the first clamping block 13 is matched with the second clamping block 17, a first compression spring 18 is connected at the bottom of the second clamping block 17, a contact plate 19 is connected at the bottom end of the first compression spring 18, the contact plate 19 is contacted with the top of the fixed plate 12, a diaphragm 20 is connected at the upper part in the expansion valve body 9, the top end of the first guide rod 16 is connected with the middle of the bottom of the diaphragm 20, a transparent plate 201 is embedded at the upper part of the front side of the expansion valve body 9, the right side of the thermal bulb 21 is connected with a curved tube 211, the top end of the curved tube 211 is connected and communicated with the middle of the top of the expansion valve body 9, inert liquid 212 is filled in the curved tube 211 and the expansion valve body 9 on the upper portion of the diaphragm 20, a second threaded hole 23 is formed in a part of the heat preservation device 22, a second bolt 24 is arranged in the second threaded hole 23, and a nut 25 is arranged at the front portion of the second bolt 24.

Still including seal cover 26, L type push rod 27, first push rod 28, pointer 29, scale bar 30 and thermometer 31, seal cover 26 has been inlayed on the right side upper portion of inflation valve body 9, the interior slidingtype of seal cover 26 is equipped with L type push rod 27, the left end of L type push rod 27 is connected with the upper portion of first guide arm 16, the lower part front side of L type push rod 27 is connected with first push rod 28, the right-hand member of first push rod 28 is connected with pointer 29, the right side upper portion of inflation valve body 9 is connected with scale bar 30, scale bar 30 is located the right-hand of seal cover 26, pointer 29 is located the front side of scale bar 30, the top of jacket 224 is connected with thermometer 31.

The left middle part of the right first clamping block 13 is provided with a groove 32, the groove 32 is internally provided with a side connected with a pressure bell 35 and a second compression spring 33, the groove 32 is internally provided with the pressure lever 34, the pressure lever 34 is positioned on the left side of the pressure bell 35, the second compression spring 33 is wound on the pressure lever 34, the left end of the second compression spring 33 is connected with the left part of the pressure lever 34, the second compression spring 33 is connected with the pressure lever 34 in a welding connection mode, and the left end of the pressure lever 34 is contacted with the right side of the second clamping block 17.

When a teacher needs to demonstrate the principle of the expansion valve, the teacher connects the evaporator 6 with an external heat source and starts the compressor 5 to operate, so that heat can be provided for the evaporator 6, when the evaporator 6 is heated, the refrigerant inside the evaporator forms high-temperature and high-pressure gaseous refrigerant, the gaseous refrigerant enters the upper part of the expansion valve 9 through the fourth connecting pipe 8 and then enters the compressor 5 through the second connecting pipe 4, the high-temperature and high-pressure gaseous refrigerant enters the condenser 2 after being compressed by the compressor 5, so that the gaseous refrigerant is liquefied into liquid refrigerant, the liquid refrigerant enters the lower part of the expansion valve 9 through the first connecting pipe 3 and then enters the evaporator 6 through the third connecting pipe 7, and thus, forming a systematic cycle. The temperature of the high-temperature high-pressure gaseous refrigerant in the fourth connecting pipe 8 can be transmitted to the thermal bulb 21 through the heat preservation device 22, so that the inert liquid 212 in the curved pipe 211 is heated and expanded, the pressure in the expansion valve body 9 on the upper portion of the diaphragm 20 is increased, the middle portion of the diaphragm 20 is deformed, teachers and students can observe the deformation degree of the diaphragm 20 through the transparent plate 201, the diaphragm 20 drives the first guide rod 16 to move downwards, the first guide sleeve 15 guides the movement of the first guide rod 16, the first guide rod 16 drives the second fixture block 17 to move downwards, a gap is formed between the first fixture block 13 and the second fixture block 17, so that the refrigerant gas which is not completely liquefied by the condenser 2 can flow upwards from the gap between the first fixture block 13 and the second fixture block 17 and then flows into the second connecting pipe 4, and accordingly, the excessive gaseous refrigerant can be prevented from entering the evaporator 6 through the third connecting pipe 7, so that the amount of liquid refrigerant entering the evaporator 6 is reduced to affect the heat absorption effect, and when the second latch 17 moves downward, the first compression spring 18 is compressed, and in the teaching demonstration process, a teacher may rotate the first bolt 11 clockwise or counterclockwise to drive the fixing plate 12 to move upward or downward, and the contact plate 19 moves upward or downward, so that the pressure can be increased or decreased to the second latch 17 through the first compression spring 18, thereby increasing or decreasing the pressure of deformation of the diaphragm 20. Therefore, teachers can demonstrate the working principle of the expansion valve through the device, and students can understand the expansion valve more easily. After the demonstration is completed, the teacher disconnects the external heat source from the evaporator 6, and after the temperature of the fourth connecting pipe 8 is reduced, the inert liquid 212 in the curved pipe 211 is cooled and contracted, so that the diaphragm 20 is restored, the second fixture block 17 is driven by the first guide rod 16 to move upwards to be reset, and the first compression spring 18 is reset.

During the use, wrap fourth connecting pipe 8 and bulb 21 together through pressing from both sides cover 224 and cushion 222, then will press from both sides the cover 224 through the cooperation of second bolt 24 and nut 25 and fix, cushion 222 plays the guard action to fourth connecting pipe 8 and bulb 21, the soft stick 223 that keeps warm plays the heat preservation effect for heat on the fourth connecting pipe 8 can be better transmit to bulb 21 on, thereby can prevent that the heat from giving off, lead to demonstrating the effect inaccurate.

First guide arm 16 moves down and drives L type push rod 27 and move down, seal cover 26 plays direction and sealing action, prevents that the gaseous state refrigerant in the expansion valve body 9 from leaking, and L type push rod 27 moves down drives pointer 29 through first push rod 28 and moves down, and pointer 29 and scale bar 30 cooperate, then the mr records the temperature that reads on thermometer 31 and the scale that pointer 29 points to, so observe the numerical value of scale bar 30 through different external heat source temperatures, can let the student understand expansion valve theory of operation.

Initially, the second compression spring 33 is in a compressed state, when the second latch 17 moves downward, under the action of the second compression spring 33, the pressing rod 34 moves leftward, the pressing rod 34 is separated from the pressing bell 35, when the second latch 17 moves upward, the second latch 17 pushes the pressing rod 34 to move rightward, the second compression spring 33 is compressed, the pressing rod 34 moves rightward, the pressing bell 35 is pressed to make a sound, and therefore the teacher and the student can be prompted that the second latch 17 has reset.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An expansion valve rack for teaching display comprises a rack (1), a condenser (2), a first connecting pipe (3), a second connecting pipe (4), a compressor (5), an evaporator (6), a third connecting pipe (7), a fourth connecting pipe (8) and an expansion valve body (9), wherein the condenser (2) is installed on the left side of the top of the rack (1), the first connecting pipe (3) is connected to the lower portion of the right side of the condenser (2), the compressor (5) is installed on the upper portion of the right side of the condenser (2), the second connecting pipe (4) is connected to the right side of the compressor (5), the expansion valve body (9) is embedded in the middle of the rack (1), the right ends of the first connecting pipe (3) and the second connecting pipe (4) are both connected and communicated with the lower portion of the left side of the expansion valve body (9), the evaporator (6) is installed on the right side of the top of the rack (1), the left side of the evaporator (6) is connected with the third, the third connecting pipe (7) is positioned below the fourth connecting pipe (8), the left ends of the third connecting pipe (7) and the fourth connecting pipe (8) are connected and communicated with the lower part of the right side of the expansion valve body (9), and the expansion valve is characterized by further comprising a first bolt (11), a fixing plate (12), a first clamping block (13), a first connecting rod (14), a first guide sleeve (15), a first guide rod (16), a second clamping block (17), a first compression spring (18), a contact plate (19), a membrane (20), a transparent plate (201), a temperature sensing bulb (21), a curved pipe (211), inert liquid (212), a heat preservation device (22), a second bolt (24) and a nut (25), a first threaded hole (10) is formed in the middle of the bottom of the expansion valve body (9), the first bolt (11) is connected in the first threaded hole (10) in a threaded connection mode, the fixing plate (12) is connected to the top of the first bolt (11), the left side and the right side of the inner lower part of the expansion valve body (9) are both connected with a first clamping block (13), the left side first clamping block (13) is positioned between the first connecting pipe (3) and the second connecting pipe (4), the right side first clamping block (13) is positioned between the third connecting pipe (7) and the fourth connecting pipe (8), a first connecting rod (14) is connected between the left side and the right side of the inner middle part of the expansion valve body (9), the middle part of the first connecting rod (14) is connected with a first guide sleeve (15), the first guide sleeve (15) is connected with a first guide rod (16) in a sliding manner, the bottom of the first guide rod (16) is connected with a second clamping block (17), the second clamping block (17) is positioned between the left first clamping block and the right first clamping block (13), the first clamping block (13) is matched with the second clamping block (17), the bottom of the second clamping block (17) is connected with a first compression spring (18), the contact plate (19) is contacted with the top of the fixed plate (12), the upper part in the expansion valve body (9) is connected with a diaphragm (20), the top end of the first guide rod (16) is connected with the middle of the bottom of the diaphragm (20), the upper part of the front side of the expansion valve body (9) is embedded with a transparent plate (201), the middle part of the fourth connecting pipe (8) is provided with a heat preservation device (22), the heat preservation device (22) is internally provided with a temperature sensing bulb (21), the temperature sensing bulb (21) is positioned above the fourth connecting pipe (8), the right side of the temperature sensing bulb (21) is connected with a curved pipe (211), the top end of the curved pipe (211) is connected and communicated with the middle of the top of the expansion valve body (9), inert liquid (212) is respectively arranged in the curved pipe (211) and the expansion valve body (9) on the upper part of the diaphragm (20), a second threaded hole (23) is formed in the part of the heat, the front part of the second bolt (24) is provided with a nut (25); heat preservation device (22) is including rubber fixture block (221), cushion (222), soft stick (223) and the cover of pressing from both sides keeps warm (224), the middle part outside of fourth connecting pipe (8) is equipped with presss from both sides cover (224), second screw hole (23) are opened respectively in the left and right sides of pressing from both sides around pressing from both sides cover (224) upper portion, two second screw holes (23) around second bolt (24) pass, the cooperation of second bolt (24) and nut (25) will press from both sides cover (224) fixed, the inboard of pressing from both sides cover (224) is equipped with cushion (222), be equipped with rubber fixture block (221) between fourth connecting pipe (8) and temperature sensing package (21), fourth connecting pipe (8) and temperature sensing package (21) all are located cushion (222), cushion (222) and the clearance department of fourth connecting pipe (8) and temperature sensing package (21) are equipped with a plurality of soft stick (223) that keep warm.

2. The expansion valve rack for teaching demonstration according to claim 1, further comprising a sealing sleeve (26), an L-shaped push rod (27), a first push rod (28), pointer (29), scale bar (30) and thermometer (31), seal cover (26) have been inlayed on the right side upper portion of inflation valve body (9), seal cover (26) internal sliding type is equipped with L type push rod (27), the left end of L type push rod (27) is connected with the upper portion of first guide arm (16), the lower part front side of L type push rod (27) is connected with first push rod (28), the right-hand member of first push rod (28) is connected with pointer (29), the right side upper portion of inflation valve body (9) is connected with scale bar (30), scale bar (30) are located right-hand of seal cover (26), pointer (29) are located the front side of scale bar (30), the top of cover (224) is connected with thermometer (31).

3. The expansion valve rack for teaching and showing as claimed in claim 2, further comprising a second compression spring (33), a pressure lever (34) and a pressure bell (35), wherein a groove (32) is formed in the middle of the left side of the right first clamping block (13), the pressure bell (35) and the second compression spring (33) are laterally connected in the groove (32), the pressure lever (34) is arranged in the groove (32), the pressure lever (34) is positioned on the left side of the pressure bell (35), the second compression spring (33) is wound on the pressure lever (34), the left end of the second compression spring (33) is connected with the left portion of the pressure lever (34), and the left end of the pressure lever (34) is in contact with the right side of the second clamping block (17).