Positive and negative pressure integrated piston system

Abstract

The utility model discloses a positive and negative pressure integrated piston system which comprises a cantilever, a shell, a negative pressure sealing cylinder and a positive pressure sealing cylinder, a cantilever through hole is formed in the middle of the cantilever, the bottom of the shell is arranged in the cantilever through hole, a gland is connected to the top of the shell in a sleeved mode, the shell and the gland are both of a hollow structure, and piston assemblies are arranged in the shell and the gland. The top of the piston assembly is fixedly connected with a piston end cover, the top of the piston end cover is fixedly connected with a positive-pressure piston tray, the bottom of the positive-pressure piston tray is sleeved with a bearing, the bearing is fixedly connected to the inner wall of the gland through a bearing pressing ring, the bottom of the piston assembly is fixedly connected with a negative-pressure connecting rod through a connecting sleeve, and the other end of the negative-pressure connecting rod is fixedly connected with a negative-pressure base plate. The negative pressure cavity channel is communicated with the positive and negative cavities, and the positive pressure cavity channel is communicated with the positive pressure cavity. The positive pressure and negative pressure integrated piston system solves the problems that positive pressure metering calibration and negative pressure metering calibration cannot be considered at the same time and reversing valves need to be frequently switched in an existing pressure metering calibration technology.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston devices, and in particular relates to a positive and negative pressure integrated piston system. Background Art

[0002] Positive and negative pressure gas piston pressure gauge is a composite pressure measuring instrument that can measure vacuum pressure gauge, vacuum sensor, digital pressure gauge, precision pressure gauge, ordinary pressure gauge, pressure transmitter and pressure sensor. One host can complete the measurement and calibration of positive gauge pressure and vacuum (negative gauge pressure). Its use value is self-evident.

[0003] Currently, a piston-type pressure gauge with integrated positive and negative pressure functions in a single unit uses two separate piston systems, such as those from renowned international brands like Volker (USA) and Wika (Germany). This dual-piston system increases manufacturing costs, complicates operation, and hinders maintenance. The reversing valve, which contains a consumable seal, requires frequent switching during use, requiring frequent maintenance.

[0004] To address this issue, the present invention has designed a novel positive and negative pressure piston system. Two pipelines in one piston system provide positive and negative pressure, respectively, without switching. To operate the system, simply switch the positive and negative pressure seals and install the positive and negative pressure piston trays. Both seals utilize end-face static seals, resulting in durable seals. Utility Model Content

[0005] The purpose of the utility model is to provide a positive and negative pressure integrated piston system, which solves the problem that the existing pressure measurement and calibration technology cannot take into account both positive and negative pressure measurement and calibration at the same time and requires frequent switching of reversing valves.

[0006] The technical solution adopted by the present invention is a positive and negative pressure integrated piston system, including a cantilever, a cantilever through hole is opened in the middle of the cantilever, and also includes an outer shell, a negative pressure sealing cylinder and a positive pressure sealing cylinder. The bottom of the outer shell is arranged in the cantilever through hole, and the top of the outer shell is sleeved with a pressure cover. The outer shell and the pressure cover are both hollow structures. A piston assembly is arranged in the outer shell and the pressure cover. The top of the piston assembly is fixedly connected to a piston end cover, and the top of the piston end cover is fixedly connected to a positive pressure piston tray. The bottom of the positive pressure piston tray is sleeved with a bearing, and the bearing is fixed to the inner wall of the pressure cover through a bearing pressure ring. The bottom of the piston assembly is fixedly connected to a negative pressure connecting rod through a connecting sleeve, and the other end of the negative pressure connecting rod is fixedly connected to a negative pressure chassis. It also includes a negative pressure chamber channel and a positive pressure chamber channel. The negative pressure chamber channel leads to the positive and negative chamber, and the positive pressure chamber channel leads to the positive pressure chamber.

[0007] The utility model is also characterized in that:

[0008] The negative pressure sealing cylinder is fixed to the top of the shell, the pressure cover and the positive pressure piston tray are both arranged in the negative pressure sealing cylinder, the positive pressure sealing cylinder is fixed to the bottom of the shell, and the negative pressure connecting rod and the negative pressure chassis are both arranged in the positive pressure sealing cylinder.

[0009] A positive pressure weight is provided on the positive pressure piston tray, and a negative pressure weight is provided on the negative pressure bottom plate.

[0010] The piston assembly includes a piston cylinder, the outer wall of the piston cylinder contacts the inner wall of the shell, a piston rod is arranged in the piston cylinder, the piston end cover is fixed to the top of the piston rod, and the piston rod is fixed to the negative pressure connecting rod through a connecting sleeve.

[0011] The connecting sleeve is fixed to the outer wall of the bottom of the piston rod, the inner wall of the bottom of the connecting sleeve contacts the outer wall of the negative pressure connecting rod, the outer wall of the bottom of the connecting sleeve is fixed with a negative pressure piston rod locking nut, and the negative pressure piston rod locking nut is sleeved on the outer wall of the negative pressure connecting rod.

[0012] A sealing groove is provided on the top of the shell along the circumferential direction. An O-type sealing ring a is provided in the sealing groove. The O-type sealing ring a is provided between the shell and the negative pressure sealing cylinder.

[0013] An O-type sealing ring b is provided between the top of the shell and the piston cylinder.

[0014] The cantilever is provided with a two-step through hole having a first step and a second step, and an O-type sealing ring c is provided on the inner wall of the cantilever at the first step and the second step.

[0015] An O-type sealing ring d is sleeved on the outer wall of the bottom of the shell, and the O-type sealing ring d is arranged between the shell and the cantilever.

[0016] The negative pressure chamber channel passes through the cantilever, the shell and the pressure cover to enter the negative pressure chamber, and the positive pressure chamber channel passes through the cantilever and the shell to enter the positive pressure chamber.

[0017] The beneficial effects of the utility model are:

[0018] This utility model provides an integrated positive and negative pressure piston system. Two pipelines in the piston system provide positive and negative pressure gas, respectively, without switching. To operate the positive and negative pressures, simply switch the positive and negative pressure sealing cylinders and install the positive and negative pressure piston trays to achieve positive and negative switching. Both the positive and negative pressure sealing cylinders use end-face static seals, and the sealing rings are durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the positive and negative pressure integrated piston system of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the cantilever of the utility model.

[0021] In the figure, 101. cantilever; 1010. first step, 1011. second step; 102. O-ring a, 103. housing, 104. pressure cover, 105. bearing pressure ring, 106. bearing, 107. positive pressure piston tray, 108. piston cylinder, 109. piston rod, 110. O-ring b, 111. O-ring c, 112. O-ring d, 113. negative pressure piston rod locking nut, 114. negative pressure connecting rod, 115. negative pressure chassis, 116. piston end cover, 117. connecting sleeve, 118. negative pressure chamber channel, 119. positive pressure chamber channel, 120. negative pressure chamber, 121. positive pressure chamber, 122. negative pressure sealing cylinder, 123. positive pressure sealing cylinder. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] The utility model provides a positive and negative pressure integrated piston system, such as Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116. The top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is connected to the shaft. The pressure ring 105 is fixed to the inner wall of the pressure cover 104, and the bottom of the piston assembly is fixed with a negative pressure connecting rod 114 through a connecting sleeve 117. The other end of the negative pressure connecting rod 114 is fixed with a negative pressure chassis 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119. The negative pressure chamber channel 118 leads to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixed to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 123 is fixed to the bottom of the shell 103. The positive pressure connecting rod 114 and the negative pressure base 115 are both arranged in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, which is convenient for using the positive pressure weight to perform positive pressure calibration measurement, and a negative pressure weight is provided on the negative pressure base 115, which is convenient for using the negative pressure weight to perform negative pressure calibration measurement; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the shell 103, a piston rod 109 is provided in the piston cylinder 108, a piston end cover 116 is fixed to the top of the piston rod 109, and the piston rod 109 is fixed to the negative pressure connecting rod 114 through a connecting sleeve 117 The connecting sleeve 117 is fixed to the outer wall of the bottom of the piston rod 109. The inner wall of the bottom of the connecting sleeve 117 contacts the outer wall of the negative pressure connecting rod 114. The outer wall of the bottom of the connecting sleeve 117 is fixed with the negative pressure piston rod locking nut 113. The negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114. A sealing groove is opened along the circumference of the top of the shell 103. An O-ring a102 is arranged in the sealing groove. The O-ring a102 is arranged between the shell 103 and the negative pressure sealing cylinder 122. An O-ring b110 is arranged between the top of the shell 103 and the piston cylinder 108. Figure 2As shown, the cantilever 101 is provided with a two-step through hole having a first step 1010 and a second step 1011. An O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011. An O-ring d112 is provided on the outer wall of the bottom of the housing 103. The O-ring d112 is provided between the housing 103 and the cantilever 101. The negative pressure chamber channel 118 passes through the cantilever 101, the housing 103 and the gland 104 to lead into the negative pressure chamber 120. The positive pressure chamber channel 119 passes through the cantilever 101 and the housing 103 to lead into the positive pressure chamber 121. When performing positive pressure measurement calibration, the negative pressure sealing cylinder 122 needs to be removed. Conversely, when performing negative pressure measurement calibration, the positive pressure sealing cylinder 123 needs to be removed.

[0024] Example 1

[0025] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1 As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston. Tray 107, a bearing 106 is sleeved on the bottom of the positive-pressure piston tray 107, and the bearing 106 is fixed to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The bottom of the piston assembly is fixed with a negative-pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative-pressure connecting rod 114 is fixed with a negative-pressure chassis 115. It also includes a negative-pressure chamber channel 118 and a positive-pressure chamber channel 119. The negative-pressure chamber channel 118 leads to the positive-negative chamber 120, and the positive-pressure chamber channel 119 leads to the positive-pressure chamber 121.

[0026] Example 2

[0027] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116. The top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is fixedly connected to the pressure cover 104 through a bearing pressure ring 105. The inner wall and the bottom of the piston assembly are fixedly connected to a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected to a negative pressure base plate 115. It also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119. The negative pressure chamber channel 118 leads to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the outer shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided in the negative pressure sealing cylinder 122, the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the outer shell 103, and the negative pressure connecting rod 114 and the negative pressure base plate 115 are both provided in the positive pressure sealing cylinder 123.

[0028] Example 3

[0029] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106, and the bearing 106 is fixed to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The bottom of the piston assembly is fixedly connected to a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected to a negative pressure chassis 115. It also includes a negative pressure cavity channel 118 The positive pressure chamber channel 119 and the negative pressure chamber channel 118 lead to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the outer shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided in the negative pressure sealing cylinder 122, the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the outer shell 103, the negative pressure connecting rod 114 and the negative pressure chassis 115 are both provided in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, and a negative pressure weight is provided on the negative pressure chassis 115; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the outer shell 103, a piston rod 109 is provided in the piston cylinder 108, the piston end cover 116 is fixedly connected to the top of the piston rod 109, and the piston rod 109 is fixedly connected to the negative pressure connecting rod 114 through the connecting sleeve 117.

[0030] Example 4

[0031] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 1 07, the bottom of the positive pressure piston tray 107 is provided with a bearing 106, and the bearing 106 is fixed to the inner wall of the pressure cover 104 through the bearing pressure ring 105. The bottom of the piston assembly is fixed with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixed with a negative pressure base plate 115, and also includes a negative pressure cavity channel 118 and a positive pressure cavity channel 119. The negative pressure cavity channel 118 leads to the positive and negative cavity 120, and the positive pressure cavity channel 119 leads to the positive pressure cavity 121; the negative pressure sealing cylinder 1 22 is fixed to the top of the housing 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, the positive pressure sealing cylinder 123 is fixed to the bottom of the housing 103, the negative pressure connecting rod 114 and the negative pressure bottom plate 115 are both provided in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, and a negative pressure weight is provided on the negative pressure bottom plate 115; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the housing 103, and the piston cylinder A piston rod 109 is provided in 108, and a piston end cover 116 is fixed to the top of the piston rod 109. The piston rod 109 is fixed to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixed to the outer wall of the bottom of the piston rod 109, and the inner wall of the bottom of the connecting sleeve 117 contacts the outer wall of the negative pressure connecting rod 114. The outer wall of the bottom of the connecting sleeve 117 is fixed with a negative pressure piston rod locking nut 113, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114.

[0032] Example 5

[0033] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116. The top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106 , the bearing 106 is fixed to the inner wall of the pressure cover 104 through the bearing pressure ring 105, the bottom of the piston assembly is fixed with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixed with a negative pressure chassis 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, the negative pressure chamber channel 118 leads to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixed to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 121 is provided with a positive pressure sealing cylinder 121. The sealing cylinder 123 is fixed to the bottom of the shell 103, and the negative pressure connecting rod 114 and the negative pressure bottom plate 115 are both arranged in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, and a negative pressure weight is provided on the negative pressure bottom plate 115; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 contacts the inner wall of the shell 103, a piston rod 109 is provided in the piston cylinder 108, a piston end cover 116 is fixed to the top of the piston rod 109, and the piston rod 109 is fixed to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixed Connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 is in contact with the outer wall of the negative pressure connecting rod 114, and the outer wall of the bottom of the connecting sleeve 117 is fixedly connected with the negative pressure piston rod locking nut 113, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114; a sealing groove is opened along the circumferential direction at the top of the outer shell 103, and an O-ring a102 is provided in the sealing groove, and the O-ring a102 is provided between the outer shell 103 and the negative pressure sealing tube 122; an O-ring b110 is provided between the top of the outer shell 103 and the piston cylinder 108.

[0034] Example 6

[0035] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116. The top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106 , the bearing 106 is fixed to the inner wall of the pressure cover 104 through the bearing pressure ring 105, the bottom of the piston assembly is fixed with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixed with a negative pressure chassis 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, the negative pressure chamber channel 118 leads to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixed to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 121 is provided with a positive pressure sealing cylinder 121. The sealing cylinder 123 is fixed to the bottom of the shell 103, and the negative pressure connecting rod 114 and the negative pressure bottom plate 115 are both arranged in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, and a negative pressure weight is provided on the negative pressure bottom plate 115; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 contacts the inner wall of the shell 103, a piston rod 109 is provided in the piston cylinder 108, a piston end cover 116 is fixed to the top of the piston rod 109, and the piston rod 109 is fixed to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixed Connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 contacts the outer wall of the negative pressure connecting rod 114. The outer wall of the bottom of the connecting sleeve 117 is fixed with the negative pressure piston rod locking nut 113, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114. A sealing groove is opened along the circumference of the top of the shell 103, and an O-type sealing ring a102 is installed in the sealing groove. The O-type sealing ring a102 is installed between the shell 103 and the negative pressure sealing cylinder 122; an O-type sealing ring b110 is installed between the top of the shell 103 and the piston cylinder 108. Figure 2 As shown, the cantilever 101 is provided with a two-step through hole having a first step 1010 and a second step 1011 , and an O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011 .

[0036] Example 7

[0037] The positive and negative pressure integrated piston system proposed in this embodiment is as follows: Figure 1As shown, it includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. A piston assembly is arranged in the shell 103 and the pressure cover 104. The top of the piston assembly is fixedly connected to a piston end cover 116. The top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The bottom of the positive pressure piston tray 107 is sleeved with a bearing 106 , the bearing 106 is fixed to the inner wall of the pressure cover 104 through the bearing pressure ring 105, the bottom of the piston assembly is fixed with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixed with a negative pressure chassis 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, the negative pressure chamber channel 118 leads to the positive and negative chambers 120, and the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixed to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 121 is provided with a positive pressure sealing cylinder 121. The sealing cylinder 123 is fixed to the bottom of the shell 103, and the negative pressure connecting rod 114 and the negative pressure bottom plate 115 are both arranged in the positive pressure sealing cylinder 123; a positive pressure weight is provided on the positive pressure piston tray 107, and a negative pressure weight is provided on the negative pressure bottom plate 115; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 contacts the inner wall of the shell 103, a piston rod 109 is provided in the piston cylinder 108, a piston end cover 116 is fixed to the top of the piston rod 109, and the piston rod 109 is fixed to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixed Connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 contacts the outer wall of the negative pressure connecting rod 114. The outer wall of the bottom of the connecting sleeve 117 is fixed with the negative pressure piston rod locking nut 113, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114. A sealing groove is opened along the circumference of the top of the shell 103, and an O-type sealing ring a102 is installed in the sealing groove. The O-type sealing ring a102 is installed between the shell 103 and the negative pressure sealing cylinder 122; an O-type sealing ring b110 is installed between the top of the shell 103 and the piston cylinder 108. Figure 2 As shown, the cantilever 101 is provided with a two-step step through hole of a first step 1010 and a second step 1011, and the inner wall of the cantilever 101 is provided with an O-ring c111 at the first step 1010 and the second step 1011; the outer wall of the bottom of the shell 103 is provided with an O-ring d112, and the O-ring d112 is arranged between the shell 103 and the cantilever 101; the negative pressure chamber channel 118 passes through the cantilever 101, the shell 103 and the pressure cover 104 to enter the negative pressure chamber 120, and the positive pressure chamber channel 119 passes through the cantilever 101 and the shell 103 to enter the positive pressure chamber 121.

Claims

1. Positive and negative pressure integrated piston system, characterized by: The invention comprises a cantilever (101), wherein a cantilever through hole is provided in the middle of the cantilever (101), a shell (103), a negative pressure sealing cylinder (122) and a positive pressure sealing cylinder (123), wherein the bottom of the shell (103) is arranged in the cantilever through hole, and a pressure cover (104) is sleeved on the top of the shell (103), and the shell (103) and the pressure cover (104) are both hollow structures, and a piston assembly is provided in the shell (103) and the pressure cover (104), and the top of the piston assembly is fixedly connected to a piston end cover (116), and the top of the piston end cover (116) is fixedly connected to a positive pressure piston tray ( 107), a bearing (106) is sleeved on the bottom of the positive-pressure piston tray (107), and the bearing (106) is fixed to the inner wall of the pressure cover (104) through the bearing pressure ring (105). The bottom of the piston assembly is fixed to a negative-pressure connecting rod (114) through a connecting sleeve (117), and the other end of the negative-pressure connecting rod (114) is fixed to a negative-pressure chassis (115). It also includes a negative-pressure chamber channel (118) and a positive-pressure chamber channel (119), wherein the negative-pressure chamber channel (118) leads to the negative-pressure chamber (120), and the positive-pressure chamber channel (119) leads to the positive-pressure chamber (121).

2. The positive and negative pressure integrated piston system according to claim 1, characterized in that: The negative pressure sealing cylinder (122) is fixed to the top of the outer shell (103), the pressure cover (104) and the positive pressure piston tray (107) are both arranged in the negative pressure sealing cylinder (122), the positive pressure sealing cylinder (123) is fixed to the bottom of the outer shell (103), and the negative pressure connecting rod (114) and the negative pressure bottom plate (115) are both arranged in the positive pressure sealing cylinder (123).

3. The positive and negative pressure integrated piston system according to claim 1, characterized in that: A positive pressure weight is provided on the positive pressure piston tray (107), and a negative pressure weight is provided on the negative pressure bottom plate (115).

4. The positive and negative pressure integrated piston system according to claim 1, characterized in that: The piston assembly includes a piston cylinder (108), the outer wall of the piston cylinder (108) is in contact with the inner wall of the outer shell (103), a piston rod (109) is provided in the piston cylinder (108), the piston end cover (116) is fixed to the top of the piston rod (109), and the piston rod (109) is fixed to the negative pressure connecting rod (114) through a connecting sleeve (117).

5. The positive and negative pressure integrated piston system according to claim 4, characterized in that: The connecting sleeve (117) is fixed to the outer wall of the bottom of the piston rod (109), the inner wall of the bottom of the connecting sleeve (117) contacts the outer wall of the negative pressure connecting rod (114), the outer wall of the bottom of the connecting sleeve (117) is fixed with a negative pressure piston rod locking nut (113), and the negative pressure piston rod locking nut (113) is sleeved on the outer wall of the negative pressure connecting rod (114).

6. The positive and negative pressure integrated piston system according to claim 4, characterized in that: A sealing groove is provided on the top of the housing (103) along the circumferential direction, an O-type sealing ring a (102) is provided in the sealing groove, and the O-type sealing ring a (102) is provided between the housing (103) and the negative pressure sealing cylinder (122).

7. The positive and negative pressure integrated piston system according to claim 4, characterized in that: An O-type sealing ring b (110) is provided between the top of the housing (103) and the piston cylinder (108).

8. The positive and negative pressure integrated piston system according to claim 1, characterized in that: The cantilever (101) is provided with a two-step through hole having a first step (1010) and a second step (1011), and an O-type sealing ring c (111) is provided on the inner wall of the cantilever (101) at the first step (1010) and the second step (1011).

9. The positive and negative pressure integrated piston system according to claim 1, characterized in that: An O-type sealing ring d (112) is sleeved on the outer wall of the bottom of the housing (103), and the O-type sealing ring d (112) is arranged between the housing (103) and the cantilever (101).

10. The positive and negative pressure integrated piston system according to claim 1, characterized in that: The negative pressure chamber channel (118) passes through the cantilever (101), the housing (103) and the pressure cover (104) to enter the negative pressure chamber (120), and the positive pressure chamber channel (119) passes through the cantilever (101) and the housing (103) to enter the positive pressure chamber (121).

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