CN215501147U

CN215501147U - Vacuum precooling equipment

Info

Publication number: CN215501147U
Application number: CN202121481763.4U
Authority: CN
Inventors: 郑贤和; 黄剑辉; 杨振能
Original assignee: Dongguan City Wan Jia Machinery Equipment Co ltd
Current assignee: Dongguan City Wan Jia Machinery Equipment Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-01-14
Anticipated expiration: 2031-06-30

Abstract

The utility model belongs to the technical field of vacuum precooling, and particularly relates to vacuum precooling equipment which comprises a cabinet body, a supporting frame, a vacuum pump assembly and a refrigerating assembly; the supporting frame comprises an upper frame and a lower frame, the upper frame is arranged on the upper side of the lower frame, a plurality of vertical struts are arranged between the upper frame and the lower frame, and a plurality of transverse struts are arranged on the upper frame and the lower frame; the refrigerating assembly comprises a water tank, a water vapor condenser and a refrigerator, the refrigerator is communicated with the water tank, the water tank is communicated with the water vapor condenser, and the water vapor condenser is arranged in the cabinet body; through erecting the structural strength that pillar and spreader cooperation increase the cabinet body, two adjacent perpendicular pillar lug connections have outer baffle, and stability between two adjacent perpendicular pillars is increased, further improves the overall stability of the cabinet body, and the security performance is high, and the practicality is strong.

Description

Vacuum precooling equipment

Technical Field

The utility model belongs to the technical field of vacuum precooling, and particularly relates to vacuum precooling equipment.

Background

Vacuum refrigeration is an ideal fruit and vegetable fresh-keeping pretreatment technology, is a one-door refrigeration technology with a high cooling speed at present, has the advantages of high cooling speed, uniform cooling effect, cleanness, no pollution and the like, and is widely applied to a precooling link in a fresh-keeping chain. It can eliminate the field heat, reduce the respiration intensity and other physiological and biochemical changes in the first time after the vegetables, fruits and flowers are harvested, so that the agricultural products are cooled uniformly and rapidly after being harvested, the microorganisms are reduced and inhibited, the pests are killed, and the rotting rate of the agricultural products is greatly reduced. The fruits and vegetables treated by the vacuum precooler have good freshness and taste, higher market price than the common fruits and vegetables and large sales profit; the freshness retention time is prolonged, and the method is suitable for long-time storage and long-distance transportation and has wide commercial prospect. However, the existing domestic fruit and vegetable vacuum precooler is only sucked by a vacuum pump, so that the pressure of the precooling chamber is difficult to maintain at a lower level, the cooling rate is quite slow, the preset target cannot be achieved, the precooled fruit and vegetable has poor quality and cannot achieve the expected effect, and the cabinet body of the fruit and vegetable vacuum precooler has a single structure, weaker structural strength and insufficient safety, and cannot achieve the conditions required by long-distance transportation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide vacuum precooling equipment, and aims to solve the technical problems that in the prior art, a fruit and vegetable vacuum precooler is low in gas extraction efficiency and unstable in cabinet structure.

In order to achieve the above object, an embodiment of the present invention provides a vacuum precooling apparatus, which includes a cabinet, a supporting frame, a vacuum pump assembly and a refrigeration assembly; the supporting frame comprises an upper frame and a lower frame, the upper frame is arranged on the upper side of the lower frame, a plurality of vertical struts are arranged between the upper frame and the lower frame, a plurality of transverse struts are arranged on the upper frame and the lower frame, each vertical strut and each transverse strut are respectively and fixedly connected with the cabinet body, and an outer-layer partition plate is fixedly connected between every two adjacent vertical struts; the vacuum pump assembly comprises a first vacuum pump, a second vacuum pump, a first exhaust pipe, a second exhaust pipe and a first exhaust pipe, wherein the first end of the first exhaust pipe is communicated with the input end of the first vacuum pump, the second end of the first exhaust pipe is communicated with the cabinet body, the output end of the first vacuum pump is connected with the first end of the second exhaust pipe, the second end of the second exhaust pipe is communicated with the input end of the second vacuum pump, and the output end of the second vacuum pump is communicated with the first exhaust pipe; the refrigeration assembly comprises a water tank, a vapor condenser and a refrigerator, the refrigerator is communicated with the water tank, the water tank is communicated with the vapor condenser, and the vapor condenser is arranged in the cabinet body.

Optionally, the refrigeration assembly further comprises a first water pump, a second water pump, a first water pipe, a second water pipe, a third water pipe and a fourth water pipe; one end of the first water pipe is communicated with the water tank, the other end of the first water pipe is communicated with the steam condenser, one end of the second water pipe is communicated with the steam condenser, the other end of the second water pipe is communicated with the water tank, one end of the third water pipe is communicated with the water tank, the other end of the third water pipe is communicated with the steam condenser, one end of the fourth water pipe is communicated with the steam condenser, and the other end of the fourth water pipe is communicated with the water tank; the first water pump is connected with the first water pipe, and the second water pump is connected with the third water pipe.

Optionally, a water tank is arranged in the cabinet body and is arranged on the lower side of the water vapor condenser.

Optionally, the support frame further includes a front frame and a rear frame spaced apart from each other in a front-rear direction, the upper frame and the lower frame are both connected between the front frame and the rear frame, the upper frame and the lower frame each include a left side frame and a right side frame, one end of the cross-strut is connected to the left side frame, and the other end of the cross-strut is connected to the right side frame.

Optionally, the vertical pillar comprises a left pillar and a right pillar, one end of the cross pillar is connected with the left pillar, and the other end of the cross pillar is connected with the right pillar.

Optionally, the top of the vertical support is fixedly connected to the bottom of the cross support.

Optionally, the cabinet body has a front end opening and a rear end opening, a water vapor condenser is arranged in the cabinet body, a sealing plate is arranged at the rear end opening, a cabinet door is arranged at the front end opening, and the cabinet door is rotatably connected to the front frame.

Optionally, a vent plate is arranged in the cabinet body, a plurality of vent holes are uniformly formed in the vent plate, and the vapor condenser is arranged between the vent plate and the sealing plate.

Optionally, braced frame still includes swing arm, damping pole and mount pad, the one end of swing arm with the cabinet door rotates to be connected, the other end of swing arm rotates to be connected in one of them on the vertical support, mount pad fixed connection in one of them on the vertical support, the one end of damping pole rotate connect in on the mount pad, the other end of damping pole rotate connect in on the swing arm.

Optionally, the vacuum pump assembly further includes a third vacuum pump and a third air exhaust pipe, a first end of the third air exhaust pipe is communicated with the output end of the first vacuum pump, and a second end of the third air exhaust pipe is communicated with the input end of the third vacuum pump.

One or more technical solutions in the vacuum pre-cooling apparatus provided by the embodiment of the present invention at least have one of the following technical effects: the refrigerator extracts water in the water tank and cools the extracted water, the water after cooling treatment is conveyed to the water tank again, and the cooled water enters the vapor condenser and returns to the water tank again after flowing through the vapor condenser; the vacuum pump assembly sucks gas in the cabinet body, the gas firstly contacts the surface of the water vapor condenser after entering the vacuum pump assembly, water vapor carried by the gas contacts the surface of the water vapor condenser and then condenses into water drops to separate the water vapor in the gas, the vacuum pump assembly sucks the gas in the cabinet body, so that the air pressure in the cabinet body becomes low, the vacuum degree in the cabinet body is improved to be convenient for storing fruit and vegetable products, the first vacuum pump works to generate negative pressure, the gas in the cabinet body flows into the first exhaust pipe, the gas enters the second exhaust pipe through the first vacuum pump, the second vacuum pump works to generate negative pressure, the flow velocity of the gas flow in the second exhaust pipe is increased, the speed of the gas flow flowing from the second exhaust pipe to the third exhaust pipe is increased, the integral air extraction efficiency of the vacuum pump assembly is improved, and the cooling rate is high; set up braced frame in the external side of cabinet, through erecting pillar and the cooperation of spreader increase the structural strength of the cabinet body, two adjacent perpendicular pillar lug connections have outer baffle, increase two adjacent stability of erecting between the pillar, further improve the overall stability of the cabinet body, the security performance is high, and the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a vacuum pre-cooling apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a cabinet provided in an embodiment of the present invention.

Fig. 3 is a sectional view of a cabinet provided by an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a refrigeration assembly according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a refrigeration assembly according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a vacuum pump assembly according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

10-cabinet body 11-cabinet door 20-supporting frame

21-upper frame 22-lower frame 23-vertical support

24-cross brace 25-outer layer partition 26-front frame

27-rear frame 28-swing arm 29-damping rod

30-vacuum pump assembly 31-first vacuum pump 32-second vacuum pump

33-first suction pipe 34-second suction pipe 35-third vacuum pump

36-third suction pipe 37-gas pipe 40-refrigeration assembly

41-water tank 42-vapor condenser 43-refrigerator

44-first water pump 45-second water pump 46-first water pipe

47-second water pipe 48-third water pipe 49-fourth water pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-6 are exemplary and intended to be used to illustrate embodiments of the utility model, and should not be construed as limiting the utility model.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In one embodiment of the present invention, as shown in fig. 1-2, a vacuum pre-cooling apparatus is provided, which includes a cabinet 10, a support frame 20, a vacuum pump assembly 30 and a refrigeration assembly 40; the supporting frame 20 comprises an upper frame 21 and a lower frame 22, the upper frame 21 is arranged on the upper side of the lower frame 22, a plurality of vertical pillars 23 are arranged between the upper frame 21 and the lower frame 22, a plurality of transverse pillars 24 are respectively arranged on the upper frame 21 and the lower frame 22, each vertical pillar 23 and each transverse pillar 24 are respectively and fixedly connected with the cabinet body 10, and outer-layer partition plates 25 are respectively and fixedly connected between two adjacent vertical pillars 23 and between two adjacent transverse pillars 24; the vacuum pump assembly 30 comprises a first vacuum pump 31, a second vacuum pump 32, a first air exhaust pipe 33, a second air exhaust pipe 34 and a first exhaust pipe, wherein the first end of the first air exhaust pipe 33 is communicated with the input end of the first vacuum pump 31, the second end of the first air exhaust pipe 33 is communicated with the cabinet body 10, the output end of the first vacuum pump 31 is connected with the first end of the second air exhaust pipe 34, the second end of the second air exhaust pipe 34 is communicated with the input end of the second vacuum pump 32, and the output end of the second vacuum pump 32 is communicated with the first exhaust pipe; the refrigeration assembly 40 includes a water tank 41, a moisture condenser 42, and a refrigerator 43, the refrigerator 43 being in communication with the water tank 41, the water tank 41 being in communication with the moisture condenser 42, the moisture condenser 42 being disposed in the cabinet 10.

In the embodiment of the present invention, the refrigerator 43 extracts water from the water tank 41 and cools the extracted water, the water after the cooling process is sent to the water tank 41 again, the cooled water enters the moisture condenser 42, and returns to the water tank 41 again after flowing through the moisture condenser 42; the vacuum pump assembly 30 sucks the gas in the cabinet 10 away, the gas enters the vacuum pump assembly 30 and contacts with the surface of the moisture condenser 42, the water vapor carried by the gas contacts with the surface of the moisture condenser 42 and condenses into water drops to separate the water vapor in the gas, the vacuum pump assembly 30 sucks the gas in the cabinet 10 away, so that the air pressure in the cabinet 10 becomes low, the vacuum degree in the cabinet 10 is improved to store fruit and vegetable products, the first vacuum pump 31 works to generate negative pressure, the gas in the cabinet 10 flows into the first suction pipe 33 and enters the second suction pipe 34 through the first vacuum pump 31, the second vacuum pump 32 works to generate negative pressure, the flow rate of the gas flow in the second suction pipe 34 is increased, the speed of the gas flow flowing from the second suction pipe 34 to the third suction pipe 36 is increased, and the whole air extraction efficiency of the vacuum pump assembly 30 is improved, the cooling rate is high; set up braced frame 20 in the cabinet body 10 outside, through erecting pillar 23 and the cooperation of cross-brace 24 increase cabinet body 10's structural strength, two adjacent perpendicular pillars 23 lug connection have outer baffle 25, increase two adjacent perpendicular pillars 23 between the stability, further improve cabinet body 10's overall stability, the security performance is high, and the practicality is strong.

Specifically, the first vacuum pump 31 is a roots vacuum pump, and the second vacuum pump 32 is a rotary vane vacuum pump.

In another embodiment of the present invention, the refrigeration assembly 40 of the vacuum pre-cooling apparatus further includes a first water pump 44, a second water pump 45, a first water pipe 46, a second water pipe 47, a third water pipe 48 and a fourth water pipe 49; one end of a first water pipe 46 is communicated with the water tank 41, the other end of the first water pipe 46 is communicated with the refrigerator 43, one end of a second water pipe 47 is communicated with the refrigerator 43, the other end of the second water pipe 47 is communicated with the water tank 41, one end of a third water pipe 48 is communicated with the water tank 41, the other end of the third water pipe 48 is communicated with the water vapor condenser 42, one end of a fourth water pipe 49 is communicated with the water vapor condenser 42, and the other end of the fourth water pipe 49 is communicated with the water tank 41; the first water pump 44 is connected with a first water pipe 46, and the second water pump 45 is connected with a fourth water pipe 49; the first water pump 44 works to suck water in the water tank 41, the water in the water tank 41 enters the refrigerator 43 through the first water pipe 46 for cooling, and is conveyed into the water tank 41 again through the second water pipe 47 after cooling treatment is finished, so that the water in the water tank 41 is cooled; the second water pump 45 works to suck water in the water tank 41, the water in the water tank 41 enters the vapor condenser 42 through the third water pipe 48, flows through the vapor condenser 42 and then returns to the water tank 41 through the fourth water pipe 49; specifically, one end of a first water pipe 46 is connected to a lower end of the water tank 41, one end of a second water pipe 47 is connected to an upper end of the water tank 41, one end of a third water pipe 48 is connected to a lower end of the water tank 41, and one end of a fourth water pipe 49 is connected to an upper end of the water tank 41.

In another embodiment of the present invention, a water tank is disposed in the cabinet 10 of the vacuum pre-cooling apparatus, the water tank is disposed at the lower side of the moisture condenser 42, the water vapor is condensed into water drops after contacting the surface of the moisture condenser 42, and the water drops are dropped into the water tank, and the water tank is configured to store the water drops.

In another embodiment of the present invention, the supporting frame 20 of the vacuum pre-cooling apparatus further includes a front frame 26 and a rear frame 27 arranged at a distance from each other, the upper frame 21 and the lower frame 22 are both connected between the front frame 26 and the rear frame 27, the upper frame 21 and the lower frame 22 each include a left side frame and a right side frame, two ends of the left side frame are respectively fixedly connected with the front frame 26 and the rear frame 27, two ends of the right side frame are respectively fixedly connected with the front frame 26 and the rear frame 27, and the front frame 26, the rear frame 27, the upper frame 21 and the lower frame 22 are connected with each other to form a rectangular frame, so that the structure is stable; one end of the cross strut 24 is connected with the left side frame, and the other end of the cross strut 24 is connected with the right side frame, so that the stability between the left side frame and the right side frame is improved.

In another embodiment of the present invention, the vertical pillars 23 of the vacuum pre-cooling apparatus include a left pillar and a right pillar, one end of the cross pillar 24 is connected to the left pillar, the other end of the cross pillar 24 is connected to the right pillar, and an annular frame is formed between the cross pillar 24 and the vertical pillars 23 and is respectively connected to four sides of the cabinet 10, so as to improve the stability of the four sides of the cabinet 10.

In another embodiment of the present invention, the top of the vertical pillar 23 of the vacuum pre-cooling apparatus is fixedly connected to the bottom of the cross pillar 24, and the top of the vertical pillar 23 supports the bottom of the cross pillar 24, so as to increase the longitudinal supporting force of the cross pillar 24, further improve the stability of the annular frame, and thereby improve the supporting effect on the cabinet 10.

In another embodiment of the present invention, the cabinet 10 of the vacuum pre-cooling apparatus has a front opening and a rear opening, the rear opening is provided with a sealing plate, the front opening is provided with a cabinet door 11, and the cabinet door 11 is rotatably connected to the front frame 26; the cabinet body 10 comprises an upper partition board, a lower partition board, a left partition board and a right partition board, the upper partition board and the lower partition board are arranged at an upper line interval, the upper partition board and the lower partition board are both connected with a cross strut 24, the left partition board and the right partition board are both arranged between the upper partition board and the lower partition board, and the upper partition board and the lower partition board are both connected with a vertical strut 23.

In another embodiment of the present invention, an aeration plate is disposed in the cabinet 10 of the vacuum pre-cooling apparatus, a plurality of aeration holes are uniformly disposed on the aeration plate, and the vapor condenser 42 is disposed between the aeration plate and the sealing plate; the gas on one side of the aeration panel flows through the aeration holes to the other side of the aeration panel and contacts the surface of the moisture condenser 42 to remove water vapor from the gas.

In another embodiment of the present invention, the supporting frame 20 of the vacuum pre-cooling apparatus further includes a swing arm 28, a damping rod 29 and a mounting seat, wherein one end of the swing arm 28 is rotatably connected to the cabinet door 11, the other end of the swing arm 28 is rotatably connected to one of the vertical pillars 23, the mounting seat is fixedly connected to one of the vertical pillars 23, one end of the damping rod 29 is rotatably connected to the mounting seat, and the other end of the damping rod 29 is rotatably connected to the swing arm 28; open cabinet door 11, swing arm 28 follows cabinet door 11 swing and pulling damping rod 29 extension, closes cabinet door 11, and swing arm 28 follows cabinet door 11 swing and compresses damping rod 29 and make its length diminish, has the cushioning effect for cabinet door 11 is closed more steadily, improves the security performance.

In another embodiment of the present invention, the vacuum pump assembly 30 of the vacuum pre-cooling apparatus further includes a third vacuum pump 35 and a third air exhaust pipe 36, a first end of the third air exhaust pipe 36 is communicated with the output end of the first vacuum pump 31, and a second end of the third air exhaust pipe 36 is communicated with the input end of the third vacuum pump 35; set up third vacuum pump 35, further increase vacuum pump assembly 30's the efficiency of bleeding, can arrange a plurality of vacuum pumps according to cabinet body 10 size, be suitable for the different circumstances, the practicality is strong.

In another embodiment of the present invention, the output end of the first vacuum pump 31 of the vacuum pre-cooling apparatus is connected to an air pipe 37, and the first end of the second suction pipe 34 and the first end of the third suction pipe 36 are both communicated with the air pipe 37; the air pipe 37 distributes the air flow and respectively conveys the air flow to the second air exhaust pipe 34 or the third air exhaust pipe 36, so that the stability of the air flow is improved.

In another embodiment of the present invention, the output end of the third vacuum pump 35 of the vacuum pre-cooling apparatus is connected to a second exhaust pipe, and the gas enters the second exhaust pipe after passing through the third vacuum pump 35, and the other gas is exhausted to the outside through the third exhaust pipe.

In another embodiment of the present invention, a pressure relief valve is disposed on the first pumping tube 33 of the vacuum pre-cooling apparatus for controlling the pressure in the first pumping tube 33, so as to prevent the pressure from exceeding the limit range and improve the stability.

In another embodiment of the present invention, the first air exhaust pipe 33 of the vacuum pre-cooling apparatus includes an upper air exhaust pipe, a lower air exhaust pipe and a three-head air pipe, a first end and a second end of the three-head air pipe are respectively communicated with the upper air exhaust pipe and the lower air exhaust pipe, and a third end of the three-head air pipe is communicated with the pressure release valve.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A vacuum pre-cooling apparatus, comprising: the refrigerator comprises a cabinet body, a supporting frame, a vacuum pump assembly and a refrigeration assembly; the supporting frame comprises an upper frame and a lower frame, the upper frame is arranged on the upper side of the lower frame, a plurality of vertical struts are arranged between the upper frame and the lower frame, a plurality of transverse struts are arranged on the upper frame and the lower frame, each vertical strut and each transverse strut are respectively and fixedly connected with the cabinet body, and an outer-layer partition plate is fixedly connected between every two adjacent vertical struts; the vacuum pump assembly comprises a first vacuum pump, a second vacuum pump, a first exhaust pipe, a second exhaust pipe and a first exhaust pipe, wherein the first end of the first exhaust pipe is communicated with the input end of the first vacuum pump, the second end of the first exhaust pipe is communicated with the cabinet body, the output end of the first vacuum pump is connected with the first end of the second exhaust pipe, the second end of the second exhaust pipe is communicated with the input end of the second vacuum pump, and the output end of the second vacuum pump is communicated with the first exhaust pipe; the refrigeration assembly comprises a water tank, a vapor condenser and a refrigerator, the refrigerator is communicated with the water tank, the water tank is communicated with the vapor condenser, and the vapor condenser is arranged in the cabinet body.

2. The vacuum pre-cooling apparatus of claim 1, wherein: the refrigeration assembly also comprises a first water pump, a second water pump, a first water pipe, a second water pipe, a third water pipe and a fourth water pipe; one end of the first water pipe is communicated with the water tank, the other end of the first water pipe is communicated with the steam condenser, one end of the second water pipe is communicated with the steam condenser, the other end of the second water pipe is communicated with the water tank, one end of the third water pipe is communicated with the water tank, the other end of the third water pipe is communicated with the steam condenser, one end of the fourth water pipe is communicated with the steam condenser, and the other end of the fourth water pipe is communicated with the water tank; the first water pump is connected with the first water pipe, and the second water pump is connected with the third water pipe.

3. The vacuum pre-cooling apparatus of claim 1, wherein: the cabinet body is internally provided with a water tank which is arranged at the lower side of the water vapor condenser.

4. The vacuum pre-cooling apparatus of claim 1, wherein: the supporting frame further comprises a front frame and a rear frame which are arranged at intervals in the front-rear direction, the upper frame and the lower frame are connected between the front frame and the rear frame, the upper frame and the lower frame respectively comprise a left side frame and a right side frame, one end of the cross strut is connected with the left side frame, and the other end of the cross strut is connected with the right side frame.

5. The vacuum pre-cooling apparatus of claim 4, wherein: the upright post comprises a left side post and a right side post, one end of the cross post is connected with the left side post, and the other end of the cross post is connected with the right side post.

6. The vacuum pre-cooling apparatus of claim 5, wherein: the top of the vertical strut is fixedly connected with the bottom of the transverse strut.

7. The vacuum pre-cooling apparatus of claim 5, wherein: the cabinet body has front end opening and rear end opening, the internal steam condenser that is equipped with of cabinet, the rear end opening is equipped with the shrouding, the front end opening is equipped with the cabinet door, the cabinet door rotate connect in on the front frame.

8. The vacuum pre-cooling apparatus of claim 7, wherein: the cabinet is equipped with the aeration board in the cabinet body, evenly be equipped with a plurality of air vents on the aeration board, the vapor condenser is located the aeration board with between the shrouding.

9. The vacuum pre-cooling apparatus of claim 7, wherein: the support frame further comprises a swing arm, a damping rod and a mounting seat, one end of the swing arm is connected with the cabinet door in a rotating mode, the other end of the swing arm is connected to one of the vertical supporting columns in a rotating mode, the mounting seat is fixedly connected to one of the vertical supporting columns, one end of the damping rod is connected to the mounting seat in a rotating mode, and the other end of the damping rod is connected to the swing arm in a rotating mode.

10. The vacuum pre-cooling apparatus according to any one of claims 1 to 9, wherein: the vacuum pump assembly further comprises a third vacuum pump and a third exhaust pipe, wherein the first end of the third exhaust pipe is communicated with the output end of the first vacuum pump, and the second end of the third exhaust pipe is communicated with the input end of the third vacuum pump.